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Vulnerability record · CVE-2025-66737 · published 26 December 2025

CVE-2025-66737: Yealink sip-t21\(p\)e2 firmware relative path traversal vulnerability

Yealink · Sip T21\(P\)E2 Firmware

Yealink T21P_E2 Phone 52.84.0.15 is vulnerable to Directory Traversal. A remote normal privileged attacker can read arbitrary files via a crafted request result read function of the diagnostic component.

4.3 CVSS 3.1 Medium EPSS 0.66% · top 50.3% CWE-23 · Relative path traversal
4.3CVSS 3.1 base score
0.66%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
1References, 1 tagged exploit
5 Jul 2026Last modified by NVD

Description

Yealink T21P_E2 Phone 52.84.0.15 is vulnerable to Directory Traversal. A remote normal privileged attacker can read arbitrary files via a crafted request result read function of the diagnostic component.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://drive.google.com/file/d/1MpxnCL4koKupqWWDmY3ljlybjIPD8ieD/view?usp=sharing Exploit

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2025-66737), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.