What is CVE-2025-20350?

CVE-2025-20350 is a high-severity vulnerability in Cisco Session Initiation Protocol (Sip) Software, classified under Stack-based Buffer Overflow. CVSS score: 7.5/10. Published 2025-10-15.

How severe is CVE-2025-20350?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2025-20350 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Cisco Session Initiation Protocol (Sip) Software

CVE-2025-20350

A vulnerability in the web UI of Cisco Desk Phone 9800 Series, Cisco IP Phone 7800 and 8800 Series, and Cisco Video Phone 8875 running Cisco SIP Software could allow an unauthenticated, remote attacker to cause a DoS condition on an affect…

Vulnerability class: Buffer Overflow

EPSS: 0.000 (12.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Cisco Session Initiation Protocol (Sip) Software — versions 12.1(1)SR1, 11.5(1), 10.3(2)

Weakness classification (CWE)

CWE-121 — Stack-based Buffer Overflow

Public proof-of-concept exploits

fkie-cad/nvd-json-data-feeds

References

cisco-sa-phone-dos-FPyjLV7A

Frequently asked questions

What is CVE-2025-20350?: CVE-2025-20350 is a high-severity vulnerability in Cisco Session Initiation Protocol (Sip) Software, classified under Stack-based Buffer Overflow. CVSS score: 7.5/10. Published 2025-10-15.
How severe is CVE-2025-20350?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2025-20350 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.