CVE-2021-27561 Yealink Device Management Server-Side Request Forgery (SSRF)
Unauthenticated attackers can execute arbitrary commands as root on Yealink Device Management systems via a specific API endpoint.
- Exploited in the wild
- Since 3 Nov 2021
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-27561?
CVE-2021-27561 is a critical command injection vulnerability in n/a, published on 15 Oct 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-78
Which versions are affected by CVE-2021-27561?
It affects 1 product.
Products include Yealink Device Management.
How do I fix CVE-2021-27561?
No fix has been published for CVE-2021-27561 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 17 Nov 2021.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2021-27561 being exploited?
Yes. Attackers have exploited CVE-2021-27561 in the wild since at least 3 Nov 2021.
Public exploit code: 1 Nuclei template.
Sources
Also known as GHSA-743m-83p4-9349.