CRITICAL CISA KEV

CVE-2021-27561

CVSS v3

9.8

CRITICAL

EPSS Score

94.1%

exploit probability

CISA KEV

Yes

known exploited

Exploitation

—

SSVC status

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.

CISA Known Exploited Vulnerability

Date Added
11/3/2021
Patch Due Date
11/17/2021
Ransomware Use
Unknown

Technical details

Published
10/15/2021

Frequently asked questions

What is CVE-2021-27561?

Yealink Device Management (DM) 3.6.0.20 allows command injection as root via the /sm/api/v1/firewall/zone/services URI, without authentication.

Is CVE-2021-27561 actively exploited?

Yes. CVE-2021-27561 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 11/17/2021.

What is the CVSS score for CVE-2021-27561?

CVE-2021-27561 has a CVSS v3 base score of 9.8 (CRITICAL severity).

Is CVE-2021-27561 affecting your environment?

Use isMalicious to check if any of your IPs or domains are associated with this vulnerability's IOCs.

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