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CVE-2021-27561

Known Exploited (CISA KEV)CRITICAL
9.8
CVSS Severity Score
EPSS Score73.6050%
EPSS Percentile95.53th
PublishedOct 15, 2021
Last ModifiedNov 10, 2025

Vulnerability 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 Platforms (CPE)

📦
Yealink

Device Management

<= 3.6.0.20

References & Advisories

🔗 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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