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CVE-2025-66738.

Source-reported disclosure and enrichment record.

SEVERITY / CVSSHIGH / 8.8CVSS 3.1 · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EXPLOITATION STATUSNot listed in the cached KEV catalogThis does not establish absence of exploitation.
RECORD STATUSModifiedModified Oct 07, 2026

Disclosure summary

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.

Source-reported weakness categories

CWE-77

Source-specific records & product guidance

Sources retain their own attribution and scoring. Follow the original record to confirm affected versions, fixed releases, and configuration conditions.

NIST National Vulnerability Database · NVD-CVE-2025-66738

Open original source · Updated Oct 07, 2026

Only CPE matches marked vulnerable=true are indexed. AND/OR platform conditions must be checked in the original NVD record.

VendorProduct / associationVersion / bounds
yealinksip-t21(p)e2_firmware52.84.0.15

Original records & references

PUBLISHED 2025-12-26T11:15:44-05:00
MODIFIED 2026-10-07T09:10:00-04:00
INGESTED 2026-10-08T12:40:11-04:00