CVE-2025-20350
HIGH EPSS 35.6%
Published Oct 15, 20258mo ago · Modified Jun 17, 20261w ago
7.5 CVSS 3.1
Published Oct 15, 2025 8mo ago
Last Modified Jun 17, 2026 1w ago
Description
A vulnerability in the web UI of Cisco Desk Phone 9800 Series, Cisco IP Phone 7800 and 8800 Series, and Cisco Video Phone 8875 running Cisco SIP Software could allow an unauthenticated, remote attacker to cause a DoS condition on an affected device. This vulnerability is due to a buffer overflow when an affected device processes HTTP packets. An attacker could exploit this vulnerability by sending crafted HTTP input to the device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition. Note: To exploit this vulnerability, the phone must be registered to Cisco Unified Communications Manager and have Web Access enabled. 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:N/A:H Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High
Threat Intelligence
EPSS Exploit Probability
35.6% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available
Weaknesses 1
CWE-121
Affected Products 85
| Vendor | Product | Version | Range |
|---|---|---|---|
| cisco | desk_phone_9871_firmware | * | ≥3.0\(1\) – ≤3.2\(1\) |
| cisco | desk_phone_9871 | * | any |
| cisco | desk_phone_9841_firmware | * | ≥3.0\(1\) – ≤3.2\(1\) |
| cisco | desk_phone_9841 | * | any |
| cisco | desk_phone_9851_firmware | * | ≥3.0\(1\) – ≤3.2\(1\) |
| cisco | desk_phone_9851 | * | any |
| cisco | desk_phone_9861_firmware | * | ≥3.0\(1\) – ≤3.2\(1\) |
| cisco | desk_phone_9861 | * | 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 | 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_8832_firmware | * | <14.3\(1\) |
| cisco | ip_phone_8832_firmware | 14.3\(1\) | any |
| cisco | ip_phone_8832_firmware | 14.3\(1\) | any |
| cisco | ip_phone_8832 | * | 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_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 | video_phone_8875_firmware | * | <2.3\(1\) |
| cisco | video_phone_8875_firmware | * | ≥3.0\(1\) – ≤3.2\(1\) |
| 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\(1\) |
| cisco | ip_phone_8821_firmware | 11.0\(0.7\) | any |
| cisco | ip_phone_8821_firmware | 11.0\(1\) | any |
| cisco | ip_phone_8821_firmware | 11.0\(2\) | any |
| cisco | ip_phone_8821_firmware | 11.0\(2\) | any |
| cisco | ip_phone_8821_firmware | 11.0\(2\) | any |
| cisco | ip_phone_8821_firmware | 11.0\(3\) | any |
| cisco | ip_phone_8821_firmware | 11.0\(3\) | any |
| cisco | ip_phone_8821_firmware | 11.0\(3\) | any |
| cisco | ip_phone_8821_firmware | 11.0\(3\) | any |
| cisco | ip_phone_8821_firmware | 11.0\(3\) | any |
| cisco | ip_phone_8821_firmware | 11.0\(3\) | any |
| cisco | ip_phone_8821_firmware | 11.0\(3\) | any |
| cisco | ip_phone_8821_firmware | 11.0\(4\) | any |
| cisco | ip_phone_8821_firmware | 11.0\(4\) | any |
| cisco | ip_phone_8821_firmware | 11.0\(4\) | any |
| cisco | ip_phone_8821_firmware | 11.0\(4\) | any |
| cisco | ip_phone_8821_firmware | 11.0\(5\) | any |
| cisco | ip_phone_8821_firmware | 11.0\(5\) | any |
| cisco | ip_phone_8821_firmware | 11.0\(5\) | any |
| cisco | ip_phone_8821_firmware | 11.0\(5\) | 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_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-dos-FPyjLV7A
Remediation
No remediation data recorded yet
Check vendor advisories and the NVD entry for patch availability.