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CVE-2021-27561

CRITICALCVSS 9.8/10Actively ExploitedEPSS 82.52%

Last modified

CVE-2021-27561 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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 has confirmed active exploitation in the wild. EPSS estimates a 82.52% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability
82.52%

99.6th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by .

Weakness Enumeration

Affected Software

VendorProductVersions
YealinkDevice Management<= 3.6.0.20

References

Timeline

Published
Last Modified
Status
Analyzed

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.
How severe is CVE-2021-27561?
CVE-2021-27561 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 82.52% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.
How do I fix CVE-2021-27561?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-27561?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST