VulnerabilityAnalyzed
CVE-2021-27561
Yealink Device Management Server-Side Request Forgery (SSRF) Vulnerability
KEVCRITICAL 9.8EPSS 82.9%
Does this matter?
Known to be exploited in the wild (CISA KEV, CISA remediation deadline 17 November 2021). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.
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.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 82.86% probability · 100th percentile
- CISA KEV
- Listed 3 November 2021 · due 17 November 2021
- Weakness
- CWE-78
- Affected
- yealink/device management
- Source
- cve@mitre.org
CISA notes
Apply updates per vendor instructions. https://nvd.nist.gov/vuln/detail/CVE-2021-27561
References
- https://ssd-disclosure.com/?p=4688Third Party Advisory
- https://ssd-disclosure.com/?p=4688Third Party Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-27561US Government Resource
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.