{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-20354",
        "assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
        "state": "PUBLISHED",
        "assignerShortName": "cisco",
        "dateReserved": "2025-10-08T11:59:15.414Z",
        "datePublished": "2026-09-02T16:14:29.829Z",
        "dateUpdated": "2026-09-02T17:58:58.074Z"
    },
    "containers": {
        "cna": {
            "title": "Cisco Secure Email S/MIME Ciphertext Decryption Vulnerabilty",
            "metrics": [
                {
                    "format": "cvssV3_1",
                    "cvssV3_1": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
                        "baseScore": 5.9,
                        "baseSeverity": "MEDIUM",
                        "attackVector": "NETWORK",
                        "attackComplexity": "HIGH",
                        "privilegesRequired": "NONE",
                        "userInteraction": "NONE",
                        "scope": "UNCHANGED",
                        "confidentialityImpact": "HIGH",
                        "integrityImpact": "NONE",
                        "availabilityImpact": "NONE"
                    }
                }
            ],
            "descriptions": [
                {
                    "lang": "en",
                    "value": "Multiple vulnerabilities in the Secure/Multipurpose Internet Mail Extensions (S/MIME) decryption functionality of Cisco Secure Email could allow an unauthenticated, remote attacker to recover plain text from encrypted email messages.\r\n\r\nThese vulnerabilities are due to insufficient validation of message integrity. An attacker could exploit these vulnerabilities by using a machine-in-the-middle technique to intercept and modify traffic between email gateways. A successful exploit could allow the attacker to obtain plaintext content from the encrypted communication."
                }
            ],
            "references": [
                {
                    "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-smime-disc-dzw4rEdY",
                    "name": "cisco-sa-esa-smime-disc-dzw4rEdY"
                }
            ],
            "exploits": [
                {
                    "lang": "en",
                    "value": "The Cisco Product Security Incident Response Team (PSIRT) is aware that a public announcement is available for the vulnerabilities that are described in this advisory.\r\n\r\nThe Cisco PSIRT is not aware of any malicious use of the vulnerabilities that are described in this advisory."
                }
            ],
            "source": {
                "advisory": "cisco-sa-esa-smime-disc-dzw4rEdY",
                "discovery": "EXTERNAL",
                "defects": [
                    "CSCwu28364"
                ]
            },
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "lang": "en",
                            "description": "Improper Validation of Integrity Check Value",
                            "type": "cwe",
                            "cweId": "CWE-354"
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "vendor": "Cisco",
                    "product": "Cisco Secure Email",
                    "versions": [
                        {
                            "version": "14.0.0-698",
                            "status": "affected"
                        },
                        {
                            "version": "13.5.1-277",
                            "status": "affected"
                        },
                        {
                            "version": "13.0.0-392",
                            "status": "affected"
                        },
                        {
                            "version": "14.2.0-620",
                            "status": "affected"
                        },
                        {
                            "version": "13.0.5-007",
                            "status": "affected"
                        },
                        {
                            "version": "13.5.4-038",
                            "status": "affected"
                        },
                        {
                            "version": "14.2.1-020",
                            "status": "affected"
                        },
                        {
                            "version": "14.3.0-032",
                            "status": "affected"
                        },
                        {
                            "version": "15.0.0-104",
                            "status": "affected"
                        },
                        {
                            "version": "15.0.1-030",
                            "status": "affected"
                        },
                        {
                            "version": "15.5.0-048",
                            "status": "affected"
                        },
                        {
                            "version": "15.5.1-055",
                            "status": "affected"
                        },
                        {
                            "version": "15.5.2-018",
                            "status": "affected"
                        },
                        {
                            "version": "16.0.0-050",
                            "status": "affected"
                        },
                        {
                            "version": "15.0.3-002",
                            "status": "affected"
                        },
                        {
                            "version": "16.0.0-054",
                            "status": "affected"
                        },
                        {
                            "version": "15.5.3-022",
                            "status": "affected"
                        },
                        {
                            "version": "16.0.1-017",
                            "status": "affected"
                        },
                        {
                            "version": "15.5.4-012",
                            "status": "affected"
                        },
                        {
                            "version": "16.0.4-016",
                            "status": "affected"
                        },
                        {
                            "version": "15.0.5-016",
                            "status": "affected"
                        },
                        {
                            "version": "16.0.2-112",
                            "status": "affected"
                        },
                        {
                            "version": "16.0.3-044",
                            "status": "affected"
                        },
                        {
                            "version": "16.5.0-780",
                            "status": "affected"
                        }
                    ],
                    "defaultStatus": "unknown"
                }
            ],
            "providerMetadata": {
                "orgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
                "shortName": "cisco",
                "dateUpdated": "2026-09-02T16:14:29.829Z"
            }
        },
        "adp": [
            {
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "id": "CVE-2026-20354",
                                "role": "CISA Coordinator",
                                "options": [
                                    {
                                        "Exploitation": "none"
                                    },
                                    {
                                        "Automatable": "no"
                                    },
                                    {
                                        "Technical Impact": "partial"
                                    }
                                ],
                                "version": "2.0.3",
                                "timestamp": "2026-09-02T16:49:02.578484Z"
                            }
                        }
                    }
                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
                    "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
                    "shortName": "CISA-ADP",
                    "dateUpdated": "2026-09-02T17:58:58.074Z"
                }
            }
        ]
    }
}