Directory Traversal in Yealink T21P_E2 Diagnostic Component Allows File Access

Publication date: 2025-12-26

Last updated on: 2026-07-05

Assigner: MITRE

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 Scores

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Meta Information

Published

2025-12-26

Last Modified

2026-07-05

Generated

2026-07-06

AI Q&A

2025-12-26

EPSS Evaluated

2026-07-05

NVD

CVE-2025-66737

Affected Vendors & Products

Vendor	Product	Version / Range
yealink	t21p_e2	52.84.0.15

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-23	The product uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize sequences such as ".." that can resolve to a location that is outside of that directory.

Attack-Flow Graph

Executive Summary

The vulnerability in Yealink T21P_E2 Phone 52.84.0.15 is a Directory Traversal issue that allows a remote attacker with normal privileges to read arbitrary files on the device by sending a specially crafted request to the diagnostic component's read function.

Impact Analysis

This vulnerability can impact you by allowing an attacker to access sensitive files on the affected device without authorization, potentially exposing confidential information and compromising the security of the system.

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