5.3

CVE-2025-20335: cisco cisco session initiation protocol (sip) software Improper Access Control

CVSS: 5.3v3.1MediumAnalyzed
Published 03-09-2025Last modified 03-09-2025
Open JSON

Vulnerability summary

CVE-2025-20335 is a medium (CVSS 5.3) Improper Access Control vulnerability in cisco cisco session initiation protocol (sip) software. EPSS estimates a 0.35% chance of exploitation in the next 30 days, higher than 27.4% of scored vulnerabilities.

Overall risk
21/100
0100
Low · default modelHow is this calculated?
CVSS score
5.3/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.35%
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. 03-09-2025
    PublishedVulnerability first disclosed.
  2. 03-09-2025
    Last modifiedVulnerability information updated.

Description

A vulnerability in the directory permissions of Cisco Desk Phone 9800 Series, Cisco IP Phone 7800 and 8800 Series, and Cisco Video Phone 8875 could allow an unauthenticated, remote attacker to write arbitrary files on an affected device. This vulnerability is due to a lack of proper authentication controls. An attacker could exploit this vulnerability by sending a crafted request to an affected device. A successful exploit could allow the attacker to perform arbitrary file writes to specific directories in the underlying operating system. Note: To exploit this vulnerability, Web Access must be enabled on the phone. Web Access is disabled by default.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.35%

Chance of exploitation in the next 30 days

Percentile

27%

Versus all other CVEs

30-day change

0.00 pp

From 0.35% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.35%

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\(1\), < 3.3\(1\)
  • desk_phone_9851_firmware≥ 3.0\(1\), < 3.3\(1\)
  • desk_phone_9861_firmware≥ 3.0\(1\), < 3.3\(1\)
  • desk_phone_9871_firmware≥ 3.0\(1\), < 3.3\(1\)

1 vendor · 18 products

References

1 links