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CVE-2021-27561: Yealink Device Management Server-Side Request Forgery (SSRF) Vulnerability

criticalknown exploitedpublic exploitCVE-2021-27561
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
Yealink Device Management contains a server-side request forgery (SSRF) vulnerability that allows for unauthenticated remote code execution.

CSIRTS triage

vendor: Yealinkproduct: Device ManagementServer-side request forgeryRemote code execution
What
A server-side request forgery (SSRF) vulnerability allows for unauthenticated remote code execution.
Who is affected
Users of Yealink Device Management are affected by this vulnerability.
Urgency
Immediate action is required as the vulnerability is actively exploited and rated critical.
Action
Update to the latest version of Yealink Device Management.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2021-11-03
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2021-27561

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2021-27561coverage & exploitation statusNVD · CVE.org

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