Vulnerability 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 Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Cisco | Desk Phone 9871 Firmware | >= 3.0\(1\), <= 3.2\(1\) |
| Cisco | Desk Phone 9871 | - |
| Cisco | Desk Phone 9841 Firmware | >= 3.0\(1\), <= 3.2\(1\) |
| Cisco | Desk Phone 9841 | - |
| Cisco | Desk Phone 9851 Firmware | >= 3.0\(1\), <= 3.2\(1\) |
| Cisco | Desk Phone 9851 | - |
| Cisco | Desk Phone 9861 Firmware | >= 3.0\(1\), <= 3.2\(1\) |
| Cisco | Desk Phone 9861 | - |
| Cisco | Ip Phone 8865 Firmware | < 14.3\(1\) |
| Cisco | Ip Phone 8865 | - |
| 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 | - |
Related Weaknesses (CWE)
References
FAQ
What is CVE-2025-20350?
CVE-2025-20350 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 attacke...
How severe is CVE-2025-20350?
CVE-2025-20350 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-20350?
Check the references section above for vendor advisories and patch information. Affected products include: Cisco Desk Phone 9871 Firmware, Cisco Desk Phone 9871, Cisco Desk Phone 9841 Firmware, Cisco Desk Phone 9841, Cisco Desk Phone 9851 Firmware.