CVE-2025-20350

Published Oct 15, 2025

Last updated 5 months ago

Overview

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.
Source
psirt@cisco.com
NVD status
Analyzed
Products
desk_phone_9871_firmware, desk_phone_9841_firmware, desk_phone_9851_firmware, desk_phone_9861_firmware, ip_phone_8865_firmware, ip_phone_7811_firmware, ip_phone_7821_firmware, ip_phone_7841_firmware, ip_phone_7861_firmware, ip_phone_8811_firmware, ip_phone_8832_firmware, ip_phone_8841_firmware, ip_phone_8845_firmware, ip_phone_8851_firmware, ip_phone_8861_firmware, video_phone_8875_firmware, ip_phone_8821_firmware

Risk scores

CVSS 3.1

Type
Primary
Base score
7.5
Impact score
3.6
Exploitability score
3.9
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Severity
HIGH

Weaknesses

psirt@cisco.com
CWE-121

Social media

Hype score
Not currently trending

Configurations