Remote Code Execution Vulnerability in Yealink T21P_E2 Phone
CVE-2025-66738

8.8HIGH

Key Information:

Vendor

Yealink

Status
Yealink T21P_E2 Phone
Vendor
CVE Published:
26 December 2025

What is CVE-2025-66738?

The Yealink T21P_E2 Phone version 52.84.0.15 is susceptible to a remote code execution vulnerability that enables an attacker with normal privileges to execute arbitrary code. This issue arises through the ping function of the diagnostic component, which can be exploited via specially crafted requests. It is crucial for users of this device to ensure they apply available patches and follow recommended security practices to safeguard their systems.

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References

http://yealink.com
https://drive.google.com/file/d/13t5ywSPJMx4487njJcH3ZTNu...

CVSS V3.1

Score:
8.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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