CVE-2025-20335Cisco Desk Phone 9800 Series, IP Phone 7800 and 8800 Series, and Video Phone 8875 with SIP Firmware Information Arbitrary File Write Vulnerability
- 5.3MediumCVSS base score
- 0.35%Exploitation in 30 daysEPSS · top 71% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By cisco
- 11 months later
· 11 months later
Published
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| ciscoCNA (assigner) | 3.1 | Medium5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N |
| NVDNVD · Analyzed | 3.1 | Medium5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N |
- EPSS (exploitation in 30 days)
- 0.35% · top 71% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.3.
Affected products
Cisco · Cisco Session Initiation Protocol (SIP) Software
- affected 12.1(1)SR1
- affected 11.5(1)
- affected 10.3(2)
- affected 10.2(2)
- affected 10.3(1)
- affected 10.3(1)SR4
- affected 11.0(1)
- affected 10.4(1)SR2 3rd Party
- affected 11.7(1)
- affected 12.1(1)
- affected 11.0(0.7) MPP
- affected 9.3(4) 3rd Party
- affected 12.5(1)SR2
- affected 10.2(1)SR1
- affected 9.3(4)SR3 3rd Party
- affected 10.2(1)
- affected 12.5(1)
- affected 10.3(1)SR2
- affected 11-0-1MSR1-1
- affected 10.4(1) 3rd Party
- affected 12.5(1)SR1
- affected 11.5(1)SR1
- affected 10.1(1)SR2
- affected 12.0(1)SR2
- affected 12.6(1)
- affected 10.3(1.11) 3rd Party
- affected 12.0(1)
- affected 12.0(1)SR1
- affected 9.3(3)
- affected 12.5(1)SR3
- affected 10.3(1)SR4b
- affected 9.3(4)SR1 3rd Party
- affected 10.3(1)SR5
- affected 10.1(1.9)
- affected 10.3(1.9) 3rd Party
- affected 9.3(4)SR2 3rd Party
- affected 10.3(1)SR1
- affected 10.3(1)SR3
- affected 10.1(1)SR1
- affected 12.0(1)SR3
- and 56 more
What to do
Exploitation: The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.
References
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2025-26614 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2025-20335)Record last updated .