Is CVE-2021-45461 actively exploited?

Yes. CVE-2021-45461 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, which means exploitation in the wild has been confirmed.

Can CVE-2021-45461 be exploited remotely?

The attack vector of CVE-2021-45461 has not been classified yet.

What is the CVSS score of CVE-2021-45461?

CVE-2021-45461 has not received a CVSS score yet.

HOME VULNERABILITIESCVE-2021-45461

UNKNOWNCISA KEVIN THE WILD

CVE-2021-45461

Published: April 11, 2026

EPSS:2.99%probability of exploitation in 30 daysPercentile:86.6th

Official Description

FreePBX, when restapps (aka Rest Phone Apps) 15.0.19.87, 15.0.19.88, 16.0.18.40, or 16.0.18.41 is installed, allows remote attackers to execute arbitrary code, as exploited in the wild in December 2021. The fixed versions are 15.0.20 and 16.0.19.

NVD Source

Technical Analysis

CVE-2021-45461 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

CISA has added CVE-2021-45461 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.