01 Record

CVE-2021-1379

Cisco IP Phones Cisco Discovery Protocol and Link Layer Discovery Protocol Remote Code Execution and Denial of Service Vulnerabilities

MediumPUBLISHEDCNA: cisco

CNA base score6.5 CVSS v3.xCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/RL:X/RC:X/E:X

View raw JSON

02 Description

Cisco IP Phones Cisco Discovery Protocol and Link Layer Discovery Protocol Remote Code Execution and Denial of Service Vulnerabilities

03 Exploitation and scoring

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.33% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 25.2% of scored records. A rank, not a probability.

NVD base score

6.5 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

NVD analysis status

Analyzed. NVD last modified this record on 2026-06-17.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2024-11-18 15:42Z1 YR AGO

Last updated

2024-11-18 16:23Z1 YR AGO

Reserved

2020-11-13

Assigning CNA

cisco

Record state

PUBLISHED

Severity

Medium (CVSS 6.5)

CNA CVSS vector

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/RL:X/RC:X/E:X

Weaknesses

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')Base

Data version

5.1

Document digest

150712d418dbad824a6733ed8dd4b210477bb0e4bd012dba501e98398a845212

05 Affected products

VendorProductVersionsPlatforms

CiscoCisco IP Phones with Multiplatform Firmware11.1.2, 11.2.1, 11.2.3, 11.2.2, 11.2.3 MSR1-1, 11.1.2 MSR1-1, 11.1.1, 11.1.2 MSR3-1, 11.0.0, 11.1.1 MSR1-1, 11.0.1, 11.1.1 MSR2-1, 11.2.4, 11.0.1 MSR1-1, 11.0.2, 11.3.1, 11.3.1 MSR1-3, 11.3.2, 11.3.1 MSR2-6, 11.3.1 MSR3-3—

CiscoCisco Session Initiation Protocol (SIP) Software9.0(3), 9.0(2)SR2, 9.0(2)SR1, 9.2(1), 9.4(2)SR1, 9.4(2), 9.4(2)SR2, 9.4(2)SR3, 9.3(1)SR2, 9.3(1)SR3, 9.3(1)SR1, 9.1(1)SR1, 9.3(1)SR4, 9.2(3), 9.2(1)SR2, 9.3(1), 9.4(2)SR4, 12.1(1)SR1, 11.5(1), 10.3(2), 10.2(2), 10.3(1), 10.3(1)SR4, 11.0(1), 10.4(1)SR2 3rd Party, 11.7(1), 12.1(1), 11.0(0.7) MPP, 9.3(4) 3rd Party, 12.5(1)SR2, 10.2(1)SR1, 9.3(4)SR3 3rd Party, 10.2(1), 12.5(1), 10.3(1)SR2, 11-0-1MSR1-1, 10.4(1) 3rd Party, 12.5(1)SR1, 11.5(1)SR1, 10.1(1)SR2, 12.0(1)SR2, 12.6(1), 10.3(1.11) 3rd Party, 12.0(1), 12.0(1)SR1, 9.3(3), 12.5(1)SR3, 10.3(1)SR4b, 9.3(4)SR1 3rd Party, 10.3(1)SR5, 10.1(1.9), 10.3(1.9) 3rd Party, 9.3(4)SR2 3rd Party, 10.3(1)SR1, 10.3(1)SR3, 10.1(1)SR1, 12.0(1)SR3, 12.6(1)SR1, 12.7(1), 10.3(1)SR6, 12.8(1), 12.7(1)SR1, 11.0(2)SR1, 11.0(4), 11.0(2), 11.0(4)SR3, 11.0(5), 11.0(3)SR2, 11.0(3)SR4, 11.0(3)SR3, 11.0(2)SR2, 11.0(4)SR1, 11.0(5)SR3, 11.0(3), 11.0(5)SR2, 11.0(3)SR6, 11.0(5)SR1, 11.0(4)SR2, 11.0(3)SR1, 11.0(3)SR5—

CiscoCisco Small Business IP Phones7.4.8, 7.4.3, 7.5.5a, 7.3.7, 7.5.2, 7.5.1, 7.4.6, 7.5.7, 7.4.4, 7.6.2SR3, 7.6.2, 7.5.6, 7.5.6c, 7.6.0, 7.4.7, 7.6.2SR6, 7.5.2b, 7.5.5, 7.5.6a, 7.6.2SR2, 7.5.3, 7.5.2a, 7.5.6(XU), 7.5.7s, 7.6.2SR4, 7.6.2SR1, 7.4.9, 7.5.5b, 7.6.2SR5, 7.5.4, 7.6.1, 7.6.2SR7—

06 References

sec.cloudapps.cisco.comcisco-sa-ipphone-rce-dos-U2PsSkz3https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ipphone-rce-dos-U2PsSkz3
sec.cloudapps.cisco.comhttps://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webex-distupd-N87eB6Z3

01 Record index

CVE-2021-1379

02 Description

03 Exploitation and scoring

04 Metadata

05 Affected products

06 References

02 Records

CVE-2021-1379

02 Description

03 Exploitation and scoring

04 Metadata

05 Affected products

06 References