Is CVE-2021-27561 actively exploited?

Yes. CVE-2021-27561 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, which means exploitation in the wild has been confirmed.

Can CVE-2021-27561 be exploited remotely?

The attack vector of CVE-2021-27561 has not been classified yet.

What is the CVSS score of CVE-2021-27561?

CVE-2021-27561 has not received a CVSS score yet.

HOME VULNERABILITIESCVE-2021-27561

HIGHCISA KEVIN THE WILD

CVE-2021-27561

Published: November 3, 2021

EPSS:94.11%probability of exploitation in 30 daysPercentile:99.9th

Official Description

Yealink Device Management contains a server-side request forgery (SSRF) vulnerability that allows for unauthenticated remote code execution.

NVD Source

CISA KEV Advisory

Yealink Device Management Server-Side Request Forgery (SSRF) Vulnerability

Yealink Device Management contains a server-side request forgery (SSRF) vulnerability that allows for unauthenticated remote code execution.

Added to KEV: 2021-11-03Federal patch deadline: 2021-11-17

Required Action (CISA)

Apply updates per vendor instructions.

Risk Analysis

This vulnerability in Yealink Device Management allows an attacker to perform server-side request forgery, which can lead to unauthenticated remote code execution. The high EPSS score of 0.94106 indicates a very high likelihood of exploitation, making this a critical vulnerability.

This vulnerability has been actively exploited in the wild and is listed in CISA's KEV catalog, confirming its active use by threat actors. It is remotely exploitable without authentication.

Recommended Action

Organizations should apply available patches or upgrades for Yealink Device Management to address this server-side request forgery vulnerability.

Generated by the CTIWATCH analysis pipeline from this CVE's metadata (CVSS, EPSS, KEV status, exploit intelligence). Verify against vendor advisories before acting.

Technical Analysis

CVE-2021-27561 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-2021-27561 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.