CVE-2025-20335
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.
- Score
- CVSS 3.1 5.3 Medium
- Status
- Analyzed - psirt@cisco.com
- Published
- 2025-09-03
- Last modified
- 2025-09-03
- Weaknesses
- CWE-284
Affected products
- Cisco Session Initiation Protocol Sip Software (Cisco)
- Desk Phone 9841 Firmware (Cisco)
- Desk Phone 9851 Firmware (Cisco)
- Desk Phone 9861 Firmware (Cisco)
- Desk Phone 9871 Firmware (Cisco)
- Ip Phone 7811 Firmware (Cisco)
- Ip Phone 7821 Firmware (Cisco)
- Ip Phone 7841 Firmware (Cisco)
- Ip Phone 7861 Firmware (Cisco)
- Ip Phone 8811 Firmware (Cisco)
- Ip Phone 8821 Firmware (Cisco)
- Ip Phone 8841 Firmware (Cisco)
- Ip Phone 8845 Firmware (Cisco)
- Ip Phone 8851 Firmware (Cisco)
- Ip Phone 8851nr Firmware (Cisco)
- Ip Phone 8861 Firmware (Cisco)
- Ip Phone 8865 Firmware (Cisco)
- Video Phone 8875 Firmware (Cisco)
References
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-phone-write-g3kcC5Df
