CVE-2025-66738

HIGH
Published Dec 26, 2025 Modified Jan 9, 2026 CWE-77

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.

CVSS v3.1 Score

8.8
HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness Type (CWE)

CWE-77 CWE-77

Affected Products

Vendor Product
yealink sip-t21\(p\)e2_firmware
yealink sip-t21\(p\)e2

References

Frequently Asked Questions

What is 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. It has a CVSS v3.1 base score of 8.8 (HIGH).
How severe is CVE-2025-66738? +
CVE-2025-66738 has a CVSS v3.1 score of 8.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.
What products are affected by CVE-2025-66738? +
CVE-2025-66738 affects products from yealink, specifically: sip-t21\(p\)e2, sip-t21\(p\)e2_firmware. Check the affected products table above for specific version ranges.
How do I check if I'm vulnerable to CVE-2025-66738? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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