Is CVE-2021-27561 actively exploited?

CVE-2021-27561 has no public evidence of in-the-wild exploitation as of 2025-11-10.

What is the CVSS score for CVE-2021-27561?

CVE-2021-27561 has a CVSS score of 9.8 (CRITICAL severity). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Patch guidance is available from yealink security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2021-27561.

1 product: 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.

Primary Vendor: YEALINK
Published: 10/15/2021
Last Modified: 11/10/2025
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.