What is CVE-2021-27561?

CVE-2021-27561 is a vulnerability known as Yealink Device Management Server-Side Request Forgery (SSRF).

What is the severity of CVE-2021-27561?

The severity of CVE-2021-27561 is critical with a severity score of 9.8.

How does CVE-2021-27561 affect Yealink Device Management?

CVE-2021-27561 affects Yealink Device Management (DM) version 3.6.0.20 and allows command injection as root via the /sm/api/v1/firewall/zone/services URI without authentication.

How can I fix CVE-2021-27561?

To fix CVE-2021-27561, it is recommended to update Yealink Device Management to a version that is not affected by the vulnerability. Patching or upgrading the software is the best course of action.

Where can I find more information about CVE-2021-27561?

More information about CVE-2021-27561 can be found at the following link: [Yealink Device Management SSRF Vulnerability](https://ssd-disclosure.com/?p=4688)

Vulnerability/
CVE-2021-27561

Exploited

critical

CWE

918 78 77

15/10/2021

7/3/2025

CVE-2021-27561: Yealink Device Management Server-Side Request Forgery (SSRF) Vulnerability

First published: Fri Oct 15 2021(Updated: )

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

Credit: cve@mitre.org cve@mitre.org cve@mitre.org

Affected Software	Affected Version	How to fix
Yealink Device Management	<=3.6.0.20
Yealink Device Management
	<=3.6.0.20

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Reference Links

Frequently Asked Questions

What is CVE-2021-27561?
CVE-2021-27561 is a vulnerability known as Yealink Device Management Server-Side Request Forgery (SSRF).
What is the severity of CVE-2021-27561?
The severity of CVE-2021-27561 is critical with a severity score of 9.8.
How does CVE-2021-27561 affect Yealink Device Management?
CVE-2021-27561 affects Yealink Device Management (DM) version 3.6.0.20 and allows command injection as root via the /sm/api/v1/firewall/zone/services URI without authentication.
How can I fix CVE-2021-27561?
To fix CVE-2021-27561, it is recommended to update Yealink Device Management to a version that is not affected by the vulnerability. Patching or upgrading the software is the best course of action.
Where can I find more information about CVE-2021-27561?
More information about CVE-2021-27561 can be found at the following link: [Yealink Device Management SSRF Vulnerability](https://ssd-disclosure.com/?p=4688)

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source/MITRE
collector/nvd-api
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vendor/yealink
canonical/yealink device management
version/yealink device management/3.6.0.20

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