CVE-2021-27561
CRITICAL KEV NUCLEIYealink DM 3.6.0.20 - Command Injection
Title source: llmExploitation Summary
CVE-2021-27561 is actively exploited and listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added November 3, 2021. A Nuclei detection template is also available.
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.
Nuclei Templates (1)
YeaLink DM 3.6.0.20 - Remote Command Injection
CRITICALby shifacyclewala,hackergautam
References (2)
Core 2
Core References
Third Party Advisory x_refsource_misc
https://ssd-disclosure.com/?p=4688
US Government Resource
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-27561
Scores
CVSS v3
9.8
EPSS
0.9411
EPSS Percentile
99.9%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA SSVC
Vulnrichment
Exploitation
active
Automatable
yes
Technical Impact
total
Details
CISA KEV
2021-11-03
VulnCheck KEV
2021-03-15
InTheWild.io
2021-02-23
ENISA EUVD
EUVD-2021-14312
CWE
CWE-78
Status
published
Products (1)
yealink/device_management
< 3.6.0.20
Published
Oct 15, 2021
KEV Added
Nov 03, 2021
Tracked Since
Feb 18, 2026