What is CVE-2025-66738?

CVE-2025-66738 is a high-severity vulnerability in Yealink Sip-T21\(p\)e2, classified under Command Injection. CVSS score: 8.8/10. Published 2025-12-26.

How severe is CVE-2025-66738?

High severity. CVSS v3 base score is 8.8 out of 10.

RCE in Yealink Sip-T21\(p\)e2

CVE-2025-66738

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.

Vulnerability class: Command Injection (OS Command Injection)

EPSS: 0.006 (44.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Yealink Sip-t21\(p\)e2
Yealink Sip-t21\(p\)e2_firmware — versions 52.84.0.15
N/a — versions n/a

Weakness classification (CWE)

CWE-77 — Command Injection

References

cve@mitre.org (Product)
cve@mitre.org (Exploit)

Frequently asked questions

What is CVE-2025-66738?: CVE-2025-66738 is a high-severity vulnerability in Yealink Sip-T21\(p\)e2, classified under Command Injection. CVSS score: 8.8/10. Published 2025-12-26.
How severe is CVE-2025-66738?: High severity. CVSS v3 base score is 8.8 out of 10.