What’s Vulnerable › Vulnerabilities

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

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2021-11-03
• EPSS: 82.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-10-15 · updated 2026-06-17
• Weakness: CWE-78

Description

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 products

• Yealink Device Management: through 3.6.0.20

References

• https://ssd-disclosure.com/?p=4688
• https://ssd-disclosure.com/?p=4688
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-27561

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