CVE-2025-66738 Command injection in n/a
A remote attacker with normal privileges can execute arbitrary code on Yealink T21P_E2 phones via a crafted request to the diagnostic ping function.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-66738?
CVE-2025-66738 is a high-severity command injection vulnerability in n/a, published on 26 Dec 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
An issue in Yealink T21P_E2 Phone 52.84.0.15 allows a remote normal privileged attacker to execute arbitrary code via a crafted request the ping function of the diagnostic component.
Weakness: CWE-77
Which versions are affected by CVE-2025-66738?
It affects 1 product.
Products include Yealink Sip-T21\(p\)e2 Firmware.
How do I fix CVE-2025-66738?
No fix has been published for CVE-2025-66738 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2025-66738 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-66738 exists.
Other vulnerabilities in n/a
Sources
Also known as GHSA-x2hf-qg23-rjpx.