Vulnerability 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 Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Cisco | Desk Phone 9841 Firmware | >= 3.0\(1\), < 3.3\(1\) |
| Cisco | Desk Phone 9841 | - |
| Cisco | Desk Phone 9851 Firmware | >= 3.0\(1\), < 3.3\(1\) |
| Cisco | Desk Phone 9851 | - |
| Cisco | Desk Phone 9861 Firmware | >= 3.0\(1\), < 3.3\(1\) |
| Cisco | Desk Phone 9861 | - |
| Cisco | Desk Phone 9871 Firmware | >= 3.0\(1\), < 3.3\(1\) |
| Cisco | Desk Phone 9871 | - |
| Cisco | Ip Phone 7811 Firmware | < 14.3\(1\) |
| Cisco | Ip Phone 7811 | - |
| Cisco | Ip Phone 7821 Firmware | < 14.3\(1\) |
| Cisco | Ip Phone 7821 | - |
| Cisco | Ip Phone 7841 Firmware | < 14.3\(1\) |
| Cisco | Ip Phone 7841 | - |
| Cisco | Ip Phone 7861 Firmware | < 14.3\(1\) |
| Cisco | Ip Phone 7861 | - |
| Cisco | Ip Phone 8811 Firmware | < 14.3\(1\) |
| Cisco | Ip Phone 8811 | - |
| Cisco | Ip Phone 8841 Firmware | < 14.3\(1\) |
| Cisco | Ip Phone 8841 | - |
Related Weaknesses (CWE)
References
FAQ
What is CVE-2025-20335?
CVE-2025-20335 is a vulnerability with a CVSS score of 5.3 (MEDIUM). 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 a...
How severe is CVE-2025-20335?
CVE-2025-20335 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-20335?
Check the references section above for vendor advisories and patch information. Affected products include: Cisco Desk Phone 9841 Firmware, Cisco Desk Phone 9841, Cisco Desk Phone 9851 Firmware, Cisco Desk Phone 9851, Cisco Desk Phone 9861 Firmware.