Is CVE-2025-66738 actively exploited?

CVE-2025-66738 has no public evidence of in-the-wild exploitation as of 2026-01-09.

What is the CVSS score for CVE-2025-66738?

CVE-2025-66738 has a CVSS score of 8.8 (HIGH severity). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

How do I patch CVE-2025-66738?

Patch guidance is available from yealink security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2025-66738.

Which products are affected by CVE-2025-66738?

1 product: yealink sip-t21\(p\)e2 firmware.

Fix CVE-2025-66738 - HIGH yealink sip-t21\(p\)e2 firmware

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 Metrics

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector: network
Complexity: low
Privileges: low
User Action: none
Scope: unchanged
Confidentiality: high
Integrity: high
Availability: high
Weaknesses: CWE-77 · Command Injection

Metadata

Primary Vendor: YEALINK
Published: 12/26/2025
Last Modified: 1/9/2026
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

CVE-2025-66738

Description

CVSS Metrics

Metadata

Affected Products

Remediation Guidance

Executive Summary