PT-2025-53601 · Yealink · Yealink T21P E2 Phone

Published 2025-12-26 · Updated 2026-01-09 · CVE-2025-66738

Positive Technologies (AI Summary)

CVSS v2.0

9.0

High

Base vector

AV:N/AC:L/Au:S/C:C/I:C/A:C

Name of the Vulnerable Software and Affected Versions Yealink T21P E2 Phone version 52.84.0.15

Description A flaw exists in the Yealink T21P E2 Phone that could allow a remote attacker with normal privileges to execute arbitrary code. This is possible through a crafted request targeting the ping function within the diagnostic component.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

RCE

Command Injection

Weakness Enumeration

CWE-77

Related Identifiers

BDU:2025-16476

CVE-2025-66738

Affected Products

Yealink T21P E2 Phone

References · 13

• 🔥 https://drive.google.com/file/d/13t5ywSPJMx4487njJcH3ZTNuc_k3h4ty/view?usp=sharing · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2025-66738 · Security Note
• https://bdu.fstec.ru/vul/2025-16476 · Security Note
• https://osv.dev/vulnerability/CVE-2025-66738 · Vendor Advisory
• https://drive.google.com/file/d/13t5ywSPJMx4487njJcH3ZTNuc_k3h4ty/view?pli=1 · Note
• http://yealink.com · Note
• https://t.me/cveNotify/148299 · Telegram Post
• https://t.me/CVEtracker/40721 · Telegram Post
• https://twitter.com/CVEnew/status/2004666612792610908 · Twitter Post
• https://twitter.com/cracbot/status/2006319484173439264 · Twitter Post
• https://t.me/cveNotify/146935 · Telegram Post
• https://twitter.com/VulmonFeeds/status/2004602047333642375 · Twitter Post
• https://twitter.com/TheHackerWire/status/2004960960709361801 · Twitter Post