7.5

CVE-2025-20350: cisco cisco session initiation protocol (sip) software Stack-based Buffer Overflow

CVSS: 7.5v3.1HighAnalyzed
Published 15-10-2025Last modified 15-10-2025
Open JSON

Vulnerability summary

CVE-2025-20350 is a high (CVSS 7.5) Stack-based Buffer Overflow vulnerability in cisco cisco session initiation protocol (sip) software. EPSS estimates a 0.48% chance of exploitation in the next 30 days, higher than 40.2% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
0.48%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 15-10-2025
    PublishedVulnerability first disclosed.
  2. 15-10-2025
    Last modifiedVulnerability information updated.

Description

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 affected device. This vulnerability is due to a buffer overflow when an affected device processes HTTP packets. An attacker could exploit this vulnerability by sending crafted HTTP input to the device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition. Note: To exploit this vulnerability, the phone must be registered to Cisco Unified Communications Manager and have Web Access enabled. Web Access is disabled by default.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.48%

Chance of exploitation in the next 30 days

Percentile

40%

Versus all other CVEs

30-day change

0.00 pp

From 0.48% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.48%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Cisco18 products
  • cisco session initiation protocol (sip) software12.1(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 | 11.0(6) | 12.8(1)SR1 | 12.8(1)SR2 | 14.0(1) | 14.0(1)SR1 | 11.0(6)SR1 | 10.3(1)SR7 | 14.0(1)SR2 | 14.1(1) | 14.0(1)SR3 | 11.0(6)SR2 | 14.1(1)SR1 | 14.1(1)SR2 | 11.0(6)SR4 | 14.2(1) | 14.2(1)SR1 | 11.0(6)SR5 | 14.1(1)SR3 | 14.2(1)SR2 | 3.1(1) | 3.0(1) | 2.3(1) | 2.3(1)SR1 | 2.2(1) | 2.1(1) | 2.0(1) | 14.2(1)SR3 | 3.1(1)SR1 | 14.3(1) | 3.2(1) | 14.3(1)SR1 | 14.2(1)SR4 | 11.0(6)SR6
  • desk_phone_9841_firmware≥ 3.0\(1\), ≤ 3.2\(1\)
  • desk_phone_9851_firmware≥ 3.0\(1\), ≤ 3.2\(1\)
  • desk_phone_9861_firmware≥ 3.0\(1\), ≤ 3.2\(1\)
  • desk_phone_9871_firmware≥ 3.0\(1\), ≤ 3.2\(1\)

1 vendor · 18 products

References

1 links