CVE-2025-20335
MEDIUM EPSS 25.0%
Published Sep 3, 202510mo ago · Modified Jun 17, 20262w ago
5.3 CVSS 3.1
Published Sep 3, 2025 10mo ago
Last Modified Jun 17, 2026 2w ago
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 Details
Base Score
Exploitability
Impact
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity Low
Availability None
Threat Intelligence
EPSS Exploit Probability
25.0% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available
Weaknesses 1
CWE-284
Affected Products 65
| Vendor | Product | Version | Range |
|---|---|---|---|
| cisco | desk_phone_9841_firmware | * | ≥3.0\(1\) – <3.3\(1\) |
| cisco | desk_phone_9841 | * | any |
| cisco | desk_phone_9851_firmware | * | ≥3.0\(1\) – <3.3\(1\) |
| cisco | desk_phone_9851 | * | any |
| cisco | desk_phone_9861_firmware | * | ≥3.0\(1\) – <3.3\(1\) |
| cisco | desk_phone_9861 | * | any |
| cisco | desk_phone_9871_firmware | * | ≥3.0\(1\) – <3.3\(1\) |
| cisco | desk_phone_9871 | * | any |
| cisco | ip_phone_7811_firmware | * | <14.3\(1\) |
| cisco | ip_phone_7811_firmware | 14.3\(1\) | any |
| cisco | ip_phone_7811_firmware | 14.3\(1\) | any |
| cisco | ip_phone_7811 | * | any |
| cisco | ip_phone_7821_firmware | * | <14.3\(1\) |
| cisco | ip_phone_7821_firmware | 14.3\(1\) | any |
| cisco | ip_phone_7821_firmware | 14.3\(1\) | any |
| cisco | ip_phone_7821 | * | any |
| cisco | ip_phone_7841_firmware | * | <14.3\(1\) |
| cisco | ip_phone_7841_firmware | 14.3\(1\) | any |
| cisco | ip_phone_7841_firmware | 14.3\(1\) | any |
| cisco | ip_phone_7841 | * | any |
| cisco | ip_phone_7861_firmware | * | <14.3\(1\) |
| cisco | ip_phone_7861_firmware | 14.3\(1\) | any |
| cisco | ip_phone_7861_firmware | 14.3\(1\) | any |
| cisco | ip_phone_7861 | * | any |
| cisco | ip_phone_8811_firmware | * | <14.3\(1\) |
| cisco | ip_phone_8811_firmware | 14.3\(1\) | any |
| cisco | ip_phone_8811_firmware | 14.3\(1\) | any |
| cisco | ip_phone_8811 | * | any |
| cisco | ip_phone_8841_firmware | * | <14.3\(1\) |
| cisco | ip_phone_8841_firmware | 14.3\(1\) | any |
| cisco | ip_phone_8841_firmware | 14.3\(1\) | any |
| cisco | ip_phone_8841 | * | any |
| cisco | ip_phone_8845_firmware | * | <14.3\(1\) |
| cisco | ip_phone_8845_firmware | 14.3\(1\) | any |
| cisco | ip_phone_8845_firmware | 14.3\(1\) | any |
| cisco | ip_phone_8845 | * | any |
| cisco | ip_phone_8851_firmware | * | <14.3\(1\) |
| cisco | ip_phone_8851_firmware | 14.3\(1\) | any |
| cisco | ip_phone_8851_firmware | 14.3\(1\) | any |
| cisco | ip_phone_8851 | * | any |
| cisco | ip_phone_8851nr_firmware | * | <14.3\(1\) |
| cisco | ip_phone_8851nr_firmware | 14.3\(1\) | any |
| cisco | ip_phone_8851nr_firmware | 14.3\(1\) | any |
| cisco | ip_phone_8851nr | * | any |
| cisco | ip_phone_8861_firmware | * | <14.3\(1\) |
| cisco | ip_phone_8861_firmware | 14.3\(1\) | any |
| cisco | ip_phone_8861_firmware | 14.3\(1\) | any |
| cisco | ip_phone_8861 | * | any |
| cisco | ip_phone_8865_firmware | * | <14.3\(1\) |
| cisco | ip_phone_8865_firmware | 14.3\(1\) | any |
| cisco | ip_phone_8865_firmware | 14.3\(1\) | any |
| cisco | ip_phone_8865 | * | any |
| cisco | video_phone_8875_firmware | * | <2.3\(1\) |
| cisco | video_phone_8875_firmware | * | ≥3.0\(1\) – <3.3\(1\) |
| cisco | video_phone_8875_firmware | 2.3\(1\) | any |
| cisco | video_phone_8875_firmware | 2.3\(1\) | any |
| cisco | video_phone_8875 | * | any |
| cisco | ip_phone_8821_firmware | * | <11.0\(6\) |
| cisco | ip_phone_8821_firmware | 11.0\(6\) | any |
| cisco | ip_phone_8821_firmware | 11.0\(6\) | any |
| cisco | ip_phone_8821_firmware | 11.0\(6\) | any |
| cisco | ip_phone_8821_firmware | 11.0\(6\) | any |
| cisco | ip_phone_8821_firmware | 11.0\(6\) | any |
| cisco | ip_phone_8821_firmware | 11.0\(6\) | any |
| cisco | ip_phone_8821 | * | any |
References 1
- sec.cloudapps.cisco.com https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-phone-write-g3kcC5Df
Remediation
No remediation data recorded yet
Check vendor advisories and the NVD entry for patch availability.