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

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

1. 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.

2. Nov 3, 2021 · CISA KEV

   Known exploited

   Apply updates per vendor instructions.

3. Nov 17, 2021 · CISA KEV

   Remediation due

   Apply updates per vendor instructions.

4. 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.

Affected

• cpe yealink/device managementversion unspecified
• vendor Yealink Device Managementversion unspecified

Sources

• CISA KEVConfirmed exploitationCVE-2021-27561

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

  cisa.gov
• CVE.orgVulnerability recordCVE-2021-27561

  Official CVE identifier

  cve.org
• FIRST EPSSExploitation probabilityCVE-2021-27561

  30-day exploitation probability 82.9%

  first.org
• NIST NVDVulnerability recordCVE-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

References

• CISA note · nvd.nist.gov
• Third Party Advisory · ssd-disclosure.com
• US Government Resource · cisa.gov