CVE-2021-27561
Yealink Device Management Server-Side Request Forgery (SSRF) Vulnerability
Published Oct 15, 2021 · updated Jun 16, 2026 · yealink device management
Yealink Device Management (DM) 3.6.0.20 allows command injection as root via the /sm/api/v1/firewall/zone/services URI, without authentication.
Timeline
Detection, updates, and resolution for this record.
Oct 15, 2021 · Catalog
Detected
Yealink Device Management (DM) 3.6.0.20 allows command injection as root via the /sm/api/v1/firewall/zone/services URI, without authentication.
Nov 3, 2021 · CISA KEV
Known exploited
Apply updates per vendor instructions.
Nov 17, 2021 · CISA KEV
Remediation due
Apply updates per vendor instructions.
Jun 16, 2026 · Catalog
Updated
Yealink Device Management (DM) 3.6.0.20 allows command injection as root via the /sm/api/v1/firewall/zone/services URI, without authentication.
Required action
Apply updates per vendor instructions.
CISA due date Nov 17, 2021
Affected
- cpe yealink/device managementversion unspecified
- vendor Yealink Device Managementversion unspecified
Sources
- CISA KEVCVE-2021-27561
Yealink Device Management contains a server-side request forgery (SSRF) vulnerability that allows for unauthenticated remote code execution.
cisa.gov - CVE.orgCVE-2021-27561
Official CVE identifier
cve.org - FIRST EPSSCVE-2021-27561
30-day exploitation probability 82.9%
first.org - NIST NVDCVE-2021-27561
Yealink Device Management (DM) 3.6.0.20 allows command injection as root via the /sm/api/v1/firewall/zone/services URI, without authentication.
nvd.nist.gov