Is CVE-2021-27561 exploited in the wild?

Yes. CVE-2021-27561 is known to be exploited in the wild, first recorded on 3 November 2021. Treat it as urgent.

How severe is CVE-2021-27561?

Critical severity, with a CVSS score of 9.8, published 3 November 2021.

Which products and versions are affected?

Yealink Device Management (DM) 3.6.0.20.

Is there a fix for CVE-2021-27561?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2021-27561 attacked?

It is attacked over the network, in a network appliance.

Am I affected by CVE-2021-27561?

Check whether you run Yealink Device Management. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

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

CVE-2021-27561 · Severity: critical · CVSS 9.8 · Exploited in the wild · Published 2021-11-03

Yealink Device Management (DM) version 3.6.0.20 is vulnerable to an unauthenticated command injection vulnerability via the /sm/api/v1/firewall/zone/services URI. An attacker can exploit this to execute commands as root, potentially leading to full system compromise.

Vendors: Yealink.

Quick answers

Is CVE-2021-27561 exploited in the wild?: Yes. CVE-2021-27561 is known to be exploited in the wild, first recorded on 3 November 2021. Treat it as urgent.
How severe is CVE-2021-27561?: Critical severity, with a CVSS score of 9.8, published 3 November 2021.
Which products and versions are affected?: Yealink Device Management (DM) 3.6.0.20.
Is there a fix for CVE-2021-27561?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2021-27561 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2021-27561?: Check whether you run Yealink Device Management. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Affected products

Yealink Device Management (DM) 3.6.0.20

Timeline

2021-10-15: disclosed: NVD Published Date
2021-11-03: kev added: Date added to CISA Known Exploited Vulnerabilities Catalog

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