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

Added to KEV
2021-11-03
Federal due date
2021-11-17
Vendor
Yealink
Product
Device Management
EPSS
99.9th percentile (score 0.941, as of 2026-06-08)
NVD CVSS v3.1
Ransomware use
Unknown
Upstream
https://nvd.nist.gov/vuln/detail/CVE-2021-27561

CISA short description

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

Required action

Apply updates per vendor instructions.

EPSS percentile is the FIRST.org exploit-probability ranking as of the date noted above; it moves daily. CVSS reflects NVD's analysis at time of publication.