Critical severity · published Oct 15, 2021
CVE-2021-27561
Yealink Device Management Server-Side Request Forgery (SSRF) Vulnerability
In wildKEV
9.8
CVSS
82.9%
EPSS
Yes
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)82.9% · higher than 100% of CVEs
Exploited in the wildYes
CISA KEVListed Nov 3, 2021
Federal remediation dueNov 17, 2021
Ransomware campaign useNot known
Affected products
Which versions
DM
Device Management · Yealink
through 3.6.0.20 · source: NVD, KEV