CVE-2025-66738

PoC —

CVSS 3.1

8.8 high

EPSS

<1%p49

Published

Dec 26, 2025 (Dec 26, 2025)

Modified

Jul 5, 2026

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.

Vendors: yealink
Products: sip-t21\(p\)e2 firmware
Weakness: CWE-77
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

NVD CVE.org GitHub PoCs EPSS (0.6%)

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