CVE-2025-66738
HIGH
8.8
CVSS Score
Published: December 26, 2025 at 12:00 AM UTC
Updated: October 7, 2026 at 01:10 PM UTC
2 products affected across 1 vendorSip T21 (p )e2 FirmwareSip T21-p E2
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Severity
HIGH8.8
Exploit prediction
EPSS 0.6%
SSVC
PoC
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.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
Sip T21-p E2· Yealinkdevice
80%All versions
Remediation
No guide yetNo remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.
References (2)
SSVC — Action Prioritization
SSVCPoCNot automatableTotal impact
SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.
CVSS
8.8HIGHCISA-ADP
- Attack Vector
- NETWORK
- Complexity
- LOW
- Privileges
- LOW
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- HIGH
- Integrity
- HIGH
- Availability
- HIGH
Vector?
Quick Info
StatusMODIFIED
CWE
CWE-77
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