Is CVE-2023-20126 actively exploited?

No active exploitation of CVE-2023-20126 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2023-20126 be exploited remotely?

Yes. CVE-2023-20126 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2023-20126?

CVE-2023-20126 has a CVSS score of 9.8 (CRITICAL).

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CRITICAL

CVE-2023-20126

CWE-306Published: May 4, 2023· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

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.

NVD Source

Technical Analysis

CVE-2023-20126 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.