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CVE-2023-20126

CriticalPublished

Cisco SPA112 2-Port Phone Adapters Remote Command Execution Vulnerability

Published: May 4, 2023
Updated: Oct 28, 2024
Assigning CNA: cisco
Evidence observed: Aug 8, 2026

Primary CVSS

9.8/ 10Critical

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS probability estimate

36.7%

Moderate · next 30 days

Percentile: 98.5%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

RancidCriscoExploit
Proof-of-concept exploit for CVE-2023-20126 targeting Cisco SPA phone adapters. Uploads malicious firmware to gain a root shell on port 23000/tcp via telnetd.

Responsible use

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