CVE-2021-27561
9.8
CRITICAL
CVSS 3.1
EPSS 82.9% · 100th pctCISA KEV · Exploited in the wild
2021-10-15•Updated 2025-10-21•KEV 2021-11-03
CISA Known Exploited Vulnerabilities
Yealink Device Management Server-Side Request Forgery (SSRF) Vulnerability is confirmed as actively exploited and is listed in the CISA KEV catalog.
Added to KEV
2021-11-03
Remediation due
2021-11-17
Required action
Apply updates per vendor instructions.
CISA notes
https://nvd.nist.gov/vuln/detail/CVE-2021-27561
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.
Severity
CVSS 3.1 · CISA9.8 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HSSVC · CISA-ADP
Exploitationactive
Automatableyes
Technical impacttotal
Affected Products
| Vendor | Product | Affected versions |
|---|---|---|
| - | - | n/a |
References
1 LinksOther references
Record Details
Published
2021-10-15
Last updated
2025-10-21
Assigner (CNA)
mitre
Credited to
-
CVE record data © The MITRE Corporation, used under the CVE Terms of Use. Exploited-in-the-wild data from the CISA Known Exploited Vulnerabilities catalog (CC0). Exploit prediction scores by FIRST EPSS (first.org/epss). This site is not endorsed or certified by MITRE, NVD, CISA, or FIRST.