CVE-2021-27561
Published · Updated
95Vexday Risk Score
Patch now. It under exploitation confirmed by CISA and has a working public exploit.
ssvc Actcvss 9.8epss 83%
from disclosure to weapon
Published on NVDOct 15
CISA KEV+19d
exploitation probability
83%top 1% of all CVEs
observed exploitation
yesCISA + VulnCheck
Action required by CISAfederal deadline: 2021-11-17
Apply updates per vendor instructions.
In short
Yealink Device Management allows attackers to run commands with root privileges without logging in, through a specific web address. This lets attackers take complete control of the device.
Technical detail
An unauthenticated remote attacker can inject arbitrary OS commands via the /sm/api/v1/firewall/zone/services endpoint in Yealink DM 3.6.0.20, resulting in code execution with root privileges. The vulnerability stems from insufficient input validation on user-supplied parameters passed to system command execution functions (CWE-78 OS Command Injection).
Summary generated and translated by AI from the official description.
The full analysis of this CVE is available in Portuguese →
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/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products
n/a · n/a