CVE-2021-27561
Yealink Device Management Server-Side Request Forgery (SSRF) Vulnerability
Yealink · Device Management
Vulnerability details
Yealink Device Management contains a server-side request forgery (SSRF) vulnerability that allows for unauthenticated remote code execution.
Added to CISA KEV: 2021-11-03
Ransomware campaign use: Unknown
CISA due date: 2021-11-17
Defensive guidance from CISA
Apply updates per vendor instructions.
This is the source's required-action field, not an independently validated patch procedure. Refer to the vendor for exact affected versions and fixes.
Source catalog date: 2026-11-06T19:44:45.1797Z · Last retrieved: 2026-11-06 21:02:26 UTC