{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-20281",
        "assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
        "state": "PUBLISHED",
        "assignerShortName": "cisco",
        "dateReserved": "2025-10-08T11:59:15.403Z",
        "datePublished": "2026-09-02T16:14:26.432Z",
        "dateUpdated": "2026-09-02T17:58:58.216Z"
    },
    "containers": {
        "cna": {
            "title": "Cisco Desk Phone 9800 Series, IP Phone 7800 and 8800 Series, and Video Phone 8875 with SIP Software Denial of Service Vulnerability",
            "metrics": [
                {
                    "format": "cvssV3_1",
                    "cvssV3_1": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                        "baseScore": 7.5,
                        "baseSeverity": "HIGH",
                        "attackVector": "NETWORK",
                        "attackComplexity": "LOW",
                        "privilegesRequired": "NONE",
                        "userInteraction": "NONE",
                        "scope": "UNCHANGED",
                        "confidentialityImpact": "NONE",
                        "integrityImpact": "NONE",
                        "availabilityImpact": "HIGH"
                    }
                }
            ],
            "descriptions": [
                {
                    "lang": "en",
                    "value": "A vulnerability in Cisco Desk Phone 9800 Series, Cisco IP Phone 7800 and 8800 Series, and Cisco Video Phone 8875 that are running Cisco Session Initiation Protocol (SIP) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.\r\n\r\nThis vulnerability is due to improper memory management when an affected device processes HTTP packets. An attacker could exploit this vulnerability by sending a continuous stream of crafted HTTP packets to the device. A successful exploit could allow the attacker to cause the affected device to continuously consume memory, resulting in a DoS condition. A manual reboot of the device is required to recover from this condition.\r\nNote: For this vulnerability to be exploitable, the phone must be registered to Cisco Unified Communications Manager (Unified CM) and have Web Access enabled. Web Access is disabled by default."
                }
            ],
            "references": [
                {
                    "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-phone-dos-txMYNRzv",
                    "name": "cisco-sa-phone-dos-txMYNRzv"
                }
            ],
            "exploits": [
                {
                    "lang": "en",
                    "value": "The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory."
                }
            ],
            "source": {
                "advisory": "cisco-sa-phone-dos-txMYNRzv",
                "discovery": "EXTERNAL",
                "defects": [
                    "CSCwu46404"
                ]
            },
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "lang": "en",
                            "description": "Missing Release of Memory after Effective Lifetime",
                            "type": "cwe",
                            "cweId": "CWE-401"
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "vendor": "Cisco",
                    "product": "Cisco Session Initiation Protocol (SIP) Software",
                    "versions": [
                        {
                            "version": "12.1(1)SR1",
                            "status": "affected"
                        },
                        {
                            "version": "11.5(1)",
                            "status": "affected"
                        },
                        {
                            "version": "10.3(2)",
                            "status": "affected"
                        },
                        {
                            "version": "10.2(2)",
                            "status": "affected"
                        },
                        {
                            "version": "10.3(1)",
                            "status": "affected"
                        },
                        {
                            "version": "10.3(1)SR4",
                            "status": "affected"
                        },
                        {
                            "version": "11.0(1)",
                            "status": "affected"
                        },
                        {
                            "version": "10.4(1)SR2 3rd Party",
                            "status": "affected"
                        },
                        {
                            "version": "11.7(1)",
                            "status": "affected"
                        },
                        {
                            "version": "12.1(1)",
                            "status": "affected"
                        },
                        {
                            "version": "11.0(0.7) MPP",
                            "status": "affected"
                        },
                        {
                            "version": "9.3(4) 3rd Party",
                            "status": "affected"
                        },
                        {
                            "version": "12.5(1)SR2",
                            "status": "affected"
                        },
                        {
                            "version": "10.2(1)SR1",
                            "status": "affected"
                        },
                        {
                            "version": "9.3(4)SR3 3rd Party",
                            "status": "affected"
                        },
                        {
                            "version": "10.2(1)",
                            "status": "affected"
                        },
                        {
                            "version": "12.5(1)",
                            "status": "affected"
                        },
                        {
                            "version": "10.3(1)SR2",
                            "status": "affected"
                        },
                        {
                            "version": "11-0-1MSR1-1",
                            "status": "affected"
                        },
                        {
                            "version": "10.4(1) 3rd Party",
                            "status": "affected"
                        },
                        {
                            "version": "12.5(1)SR1",
                            "status": "affected"
                        },
                        {
                            "version": "11.5(1)SR1",
                            "status": "affected"
                        },
                        {
                            "version": "10.1(1)SR2",
                            "status": "affected"
                        },
                        {
                            "version": "12.0(1)SR2",
                            "status": "affected"
                        },
                        {
                            "version": "12.6(1)",
                            "status": "affected"
                        },
                        {
                            "version": "10.3(1.11) 3rd Party",
                            "status": "affected"
                        },
                        {
                            "version": "12.0(1)",
                            "status": "affected"
                        },
                        {
                            "version": "12.0(1)SR1",
                            "status": "affected"
                        },
                        {
                            "version": "9.3(3)",
                            "status": "affected"
                        },
                        {
                            "version": "12.5(1)SR3",
                            "status": "affected"
                        },
                        {
                            "version": "10.3(1)SR4b",
                            "status": "affected"
                        },
                        {
                            "version": "9.3(4)SR1 3rd Party",
                            "status": "affected"
                        },
                        {
                            "version": "10.3(1)SR5",
                            "status": "affected"
                        },
                        {
                            "version": "10.1(1.9)",
                            "status": "affected"
                        },
                        {
                            "version": "10.3(1.9) 3rd Party",
                            "status": "affected"
                        },
                        {
                            "version": "9.3(4)SR2 3rd Party",
                            "status": "affected"
                        },
                        {
                            "version": "10.3(1)SR1",
                            "status": "affected"
                        },
                        {
                            "version": "10.3(1)SR3",
                            "status": "affected"
                        },
                        {
                            "version": "10.1(1)SR1",
                            "status": "affected"
                        },
                        {
                            "version": "12.0(1)SR3",
                            "status": "affected"
                        },
                        {
                            "version": "12.6(1)SR1",
                            "status": "affected"
                        },
                        {
                            "version": "12.7(1)",
                            "status": "affected"
                        },
                        {
                            "version": "10.3(1)SR6",
                            "status": "affected"
                        },
                        {
                            "version": "12.8(1)",
                            "status": "affected"
                        },
                        {
                            "version": "12.7(1)SR1",
                            "status": "affected"
                        },
                        {
                            "version": "11.0(2)SR1",
                            "status": "affected"
                        },
                        {
                            "version": "11.0(4)",
                            "status": "affected"
                        },
                        {
                            "version": "11.0(2)",
                            "status": "affected"
                        },
                        {
                            "version": "11.0(4)SR3",
                            "status": "affected"
                        },
                        {
                            "version": "11.0(5)",
                            "status": "affected"
                        },
                        {
                            "version": "11.0(3)SR2",
                            "status": "affected"
                        },
                        {
                            "version": "11.0(3)SR4",
                            "status": "affected"
                        },
                        {
                            "version": "11.0(3)SR3",
                            "status": "affected"
                        },
                        {
                            "version": "11.0(2)SR2",
                            "status": "affected"
                        },
                        {
                            "version": "11.0(4)SR1",
                            "status": "affected"
                        },
                        {
                            "version": "11.0(5)SR3",
                            "status": "affected"
                        },
                        {
                            "version": "11.0(3)",
                            "status": "affected"
                        },
                        {
                            "version": "11.0(5)SR2",
                            "status": "affected"
                        },
                        {
                            "version": "11.0(3)SR6",
                            "status": "affected"
                        },
                        {
                            "version": "11.0(5)SR1",
                            "status": "affected"
                        },
                        {
                            "version": "11.0(4)SR2",
                            "status": "affected"
                        },
                        {
                            "version": "11.0(3)SR1",
                            "status": "affected"
                        },
                        {
                            "version": "11.0(3)SR5",
                            "status": "affected"
                        },
                        {
                            "version": "11.0(6)",
                            "status": "affected"
                        },
                        {
                            "version": "12.8(1)SR1",
                            "status": "affected"
                        },
                        {
                            "version": "12.8(1)SR2",
                            "status": "affected"
                        },
                        {
                            "version": "14.0(1)",
                            "status": "affected"
                        },
                        {
                            "version": "14.0(1)SR1",
                            "status": "affected"
                        },
                        {
                            "version": "11.0(6)SR1",
                            "status": "affected"
                        },
                        {
                            "version": "10.3(1)SR7",
                            "status": "affected"
                        },
                        {
                            "version": "14.0(1)SR2",
                            "status": "affected"
                        },
                        {
                            "version": "14.1(1)",
                            "status": "affected"
                        },
                        {
                            "version": "14.0(1)SR3",
                            "status": "affected"
                        },
                        {
                            "version": "11.0(6)SR2",
                            "status": "affected"
                        },
                        {
                            "version": "14.1(1)SR1",
                            "status": "affected"
                        },
                        {
                            "version": "14.1(1)SR2",
                            "status": "affected"
                        },
                        {
                            "version": "11.0(6)SR4",
                            "status": "affected"
                        },
                        {
                            "version": "14.2(1)",
                            "status": "affected"
                        },
                        {
                            "version": "14.2(1)SR1",
                            "status": "affected"
                        },
                        {
                            "version": "11.0(6)SR5",
                            "status": "affected"
                        },
                        {
                            "version": "14.1(1)SR3",
                            "status": "affected"
                        },
                        {
                            "version": "14.2(1)SR2",
                            "status": "affected"
                        },
                        {
                            "version": "3.1(1)",
                            "status": "affected"
                        },
                        {
                            "version": "3.0(1)",
                            "status": "affected"
                        },
                        {
                            "version": "2.3(1)",
                            "status": "affected"
                        },
                        {
                            "version": "2.3(1)SR1",
                            "status": "affected"
                        },
                        {
                            "version": "2.2(1)",
                            "status": "affected"
                        },
                        {
                            "version": "2.1(1)",
                            "status": "affected"
                        },
                        {
                            "version": "2.0(1)",
                            "status": "affected"
                        },
                        {
                            "version": "14.2(1)SR3",
                            "status": "affected"
                        },
                        {
                            "version": "3.1(1)SR1",
                            "status": "affected"
                        },
                        {
                            "version": "14.3(1)",
                            "status": "affected"
                        },
                        {
                            "version": "3.2(1)",
                            "status": "affected"
                        },
                        {
                            "version": "14.3(1)SR1",
                            "status": "affected"
                        },
                        {
                            "version": "14.2(1)SR4",
                            "status": "affected"
                        },
                        {
                            "version": "3.3(1)",
                            "status": "affected"
                        },
                        {
                            "version": "11.0(6)SR6",
                            "status": "affected"
                        },
                        {
                            "version": "14.3(1)SR2",
                            "status": "affected"
                        },
                        {
                            "version": "3.4(1)",
                            "status": "affected"
                        },
                        {
                            "version": "14.3(1)SR3",
                            "status": "affected"
                        },
                        {
                            "version": "3.5(1)",
                            "status": "affected"
                        },
                        {
                            "version": "11.0(6)SR7",
                            "status": "affected"
                        },
                        {
                            "version": "3.5(1)SR1",
                            "status": "affected"
                        },
                        {
                            "version": "14.4(1)",
                            "status": "affected"
                        },
                        {
                            "version": "3.6(1)",
                            "status": "affected"
                        },
                        {
                            "version": "4.0(1)",
                            "status": "affected"
                        },
                        {
                            "version": "14.4(1)SR1",
                            "status": "affected"
                        },
                        {
                            "version": "4.1(1)",
                            "status": "affected"
                        },
                        {
                            "version": "14.4(1)SR2",
                            "status": "affected"
                        },
                        {
                            "version": "4.1(1)SR1",
                            "status": "affected"
                        }
                    ],
                    "defaultStatus": "unknown"
                }
            ],
            "providerMetadata": {
                "orgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
                "shortName": "cisco",
                "dateUpdated": "2026-09-02T16:14:26.432Z"
            }
        },
        "adp": [
            {
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "id": "CVE-2026-20281",
                                "role": "CISA Coordinator",
                                "options": [
                                    {
                                        "Exploitation": "none"
                                    },
                                    {
                                        "Automatable": "yes"
                                    },
                                    {
                                        "Technical Impact": "partial"
                                    }
                                ],
                                "version": "2.0.3",
                                "timestamp": "2026-09-02T16:45:26.338821Z"
                            }
                        }
                    }
                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
                    "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
                    "shortName": "CISA-ADP",
                    "dateUpdated": "2026-09-02T17:58:58.216Z"
                }
            }
        ]
    }
}