CVE-2025-20350: high-severity vulnerability in Cisco Session Initiation Protocol (SIP) Software
Cisco Desk Phone 9800 Series, IP Phone 7800 and 8800 Series, and Video Phone 8875 with SIP Firmware Denial of Service Vulnerability
Published
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.5epss 0.5%
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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
Cisco · Cisco Session Initiation Protocol (SIP) SoftwareRelated CVEs — Cisco Session Initiation Protocol (SIP) Software
In the same product, most dangerous first.
CVE-2022-20968HIGHCVE-2022-20968EPSS 6.4%CVE-2023-20018HIGHCVE-2023-20018EPSS 0.6%CVE-2026-20281HIGHCisco Desk Phone 9800 Series, IP Phone 7800 and 8800 Series, and Video Phone 8875 with SIP Software Denial of Service VulnerabilityEPSS 0.6%CVE-2023-20265MEDIUMCVE-2023-20265EPSS 0.5%CVE-2024-20445MEDIUMCisco IP Phone 7800, 8800, and 9800 Series Information Disclosure VulnerabilityEPSS 0.4%CVE-2025-20336MEDIUMCisco Desk Phone 9800 Series, IP Phone 7800 and 8800 Series, and Video Phone 8875 with SIP Firmware Information Disclosure VulnerabilityEPSS 0.4%