CVE-2023-20126: Cisco SPA112 Firmware

Critical severity, CVSS 9.8. EPSS: 36.7% chance of exploitation in the next 30 days.

A vulnerability in the web-based management interface of Cisco SPA112 2-Port Phone Adapters could allow an unauthenticated, remote attacker to execute arbitrary code on an affected device. This vulnerability is due to a missing authentication process within the firmware upgrade function. An attacker could exploit this vulnerability by upgrading an affected device to a crafted version of firmware. A successful exploit could allow the attacker to execute arbitrary code on the affected device with full privileges. Cisco has not released firmware updates to address this vulnerability.

Affected products

• Cisco SPA112 Firmware: version 1.4.1 only

Published 2023-05-04. Last modified 2026-06-17.