Disclosure summary
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.
Source-reported weakness categories
CWE-121
Source-specific records & product guidance
Sources retain their own attribution and scoring. Follow the original record to confirm affected versions, fixed releases, and configuration conditions.
NIST National Vulnerability Database · NVD-CVE-2025-20350
Open original source · Updated Oct 08, 2026
Only CPE matches marked vulnerable=true are indexed. AND/OR platform conditions must be checked in the original NVD record.
| Vendor | Product / association | Version / bounds |
|---|---|---|
| cisco | desk_phone_9871_firmware | * {"versionStartIncluding":"3.0\\(1\\)","versionEndIncluding":"3.2\\(1\\)"} |
| cisco | desk_phone_9841_firmware | * {"versionStartIncluding":"3.0\\(1\\)","versionEndIncluding":"3.2\\(1\\)"} |
| cisco | desk_phone_9851_firmware | * {"versionStartIncluding":"3.0\\(1\\)","versionEndIncluding":"3.2\\(1\\)"} |
| cisco | desk_phone_9861_firmware | * {"versionStartIncluding":"3.0\\(1\\)","versionEndIncluding":"3.2\\(1\\)"} |
| cisco | ip_phone_8865_firmware | * {"versionEndExcluding":"14.3\\(1\\)"} |
| cisco | ip_phone_8865_firmware | 14.3(1) |
| cisco | ip_phone_8865_firmware | 14.3(1) |
| cisco | ip_phone_7811_firmware | * {"versionEndExcluding":"14.3\\(1\\)"} |
| cisco | ip_phone_7811_firmware | 14.3(1) |
| cisco | ip_phone_7811_firmware | 14.3(1) |
| cisco | ip_phone_7821_firmware | * {"versionEndExcluding":"14.3\\(1\\)"} |
| cisco | ip_phone_7821_firmware | 14.3(1) |
| cisco | ip_phone_7821_firmware | 14.3(1) |
| cisco | ip_phone_7841_firmware | * {"versionEndExcluding":"14.3\\(1\\)"} |
| cisco | ip_phone_7841_firmware | 14.3(1) |
| cisco | ip_phone_7841_firmware | 14.3(1) |
| cisco | ip_phone_7861_firmware | * {"versionEndExcluding":"14.3\\(1\\)"} |
| cisco | ip_phone_7861_firmware | 14.3(1) |
| cisco | ip_phone_7861_firmware | 14.3(1) |
| cisco | ip_phone_8811_firmware | * {"versionEndExcluding":"14.3\\(1\\)"} |
| cisco | ip_phone_8811_firmware | 14.3(1) |
| cisco | ip_phone_8811_firmware | 14.3(1) |
| cisco | ip_phone_8832_firmware | * {"versionEndExcluding":"14.3\\(1\\)"} |
| cisco | ip_phone_8832_firmware | 14.3(1) |
| cisco | ip_phone_8832_firmware | 14.3(1) |
| cisco | ip_phone_8841_firmware | * {"versionEndExcluding":"14.3\\(1\\)"} |
| cisco | ip_phone_8841_firmware | 14.3(1) |
| cisco | ip_phone_8841_firmware | 14.3(1) |
| cisco | ip_phone_8845_firmware | * {"versionEndExcluding":"14.3\\(1\\)"} |
| cisco | ip_phone_8845_firmware | 14.3(1) |
| cisco | ip_phone_8845_firmware | 14.3(1) |
| cisco | ip_phone_8851_firmware | * {"versionEndExcluding":"14.3\\(1\\)"} |
| cisco | ip_phone_8851_firmware | 14.3(1) |
| cisco | ip_phone_8851_firmware | 14.3(1) |
| cisco | ip_phone_8861_firmware | * {"versionEndExcluding":"14.3\\(1\\)"} |
| cisco | ip_phone_8861_firmware | 14.3(1) |
| cisco | ip_phone_8861_firmware | 14.3(1) |
| cisco | video_phone_8875_firmware | * {"versionStartIncluding":"3.0\\(1\\)","versionEndIncluding":"3.2\\(1\\)"} |
| cisco | video_phone_8875_firmware | 2.3(1) |
| cisco | video_phone_8875_firmware | 2.3(1) |
| cisco | ip_phone_8821_firmware | * {"versionEndExcluding":"11.0\\(1\\)"} |
| cisco | ip_phone_8821_firmware | 11.0(0.7) |
| cisco | ip_phone_8821_firmware | 11.0(1) |
| cisco | ip_phone_8821_firmware | 11.0(2) |
| cisco | ip_phone_8821_firmware | 11.0(2) |
| cisco | ip_phone_8821_firmware | 11.0(2) |
| cisco | ip_phone_8821_firmware | 11.0(3) |
| cisco | ip_phone_8821_firmware | 11.0(3) |
| cisco | ip_phone_8821_firmware | 11.0(3) |
| cisco | ip_phone_8821_firmware | 11.0(3) |
| cisco | ip_phone_8821_firmware | 11.0(3) |
| cisco | ip_phone_8821_firmware | 11.0(3) |
| cisco | ip_phone_8821_firmware | 11.0(3) |
| cisco | ip_phone_8821_firmware | 11.0(4) |
| cisco | ip_phone_8821_firmware | 11.0(4) |
| cisco | ip_phone_8821_firmware | 11.0(4) |
| cisco | ip_phone_8821_firmware | 11.0(4) |
| cisco | ip_phone_8821_firmware | 11.0(5) |
| cisco | ip_phone_8821_firmware | 11.0(5) |
| cisco | ip_phone_8821_firmware | 11.0(5) |
| cisco | ip_phone_8821_firmware | 11.0(5) |
| cisco | ip_phone_8821_firmware | 11.0(6) |
| cisco | ip_phone_8821_firmware | 11.0(6) |
| cisco | ip_phone_8821_firmware | 11.0(6) |
| cisco | ip_phone_8821_firmware | 11.0(6) |
| cisco | ip_phone_8821_firmware | 11.0(6) |
| cisco | ip_phone_8821_firmware | 11.0(6) |
Original records & references
- NIST NVD record
- CVE Program record
- sec.cloudapps.cisco.com — Vendor Advisory
PUBLISHED 2025-10-15T13:15:48-04:00
MODIFIED 2026-10-08T07:10:00-04:00
INGESTED 2026-10-08T12:30:43-04:00