CVE-2018-16221

What it is

The diagnostics web interface in the Yeahlink Ultra-elegant IP Phone SIP-T41P (firmware 66.83.0.35) does not validate (escape) the path information (path traversal), which allows an authenticated remote attacker to get access to privileged information (e.g., /etc/passwd) via path traversal (relative path information in the file parameter of the corresponding POST request).

At a glance

Exploitability

Can be exploited from the same network segment with a low-privilege account. High risk of data exposure, data tampering, service disruption.

Exploit odds

1.5% chance of exploitation in the next 30 days (EPSS).

Fix

No patch or advisory is linked yet. Look at mitigations or restrict exposure.

Timeline

1. 2019-05-29 18:29 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 01:43 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 1.5% in the next 30 days (EPSS).
• Severity: 8.0 HIGH (CVSS).
• Fix: none linked yet, which raises it.

Details

Published

2019-05-29 18:29 UTC

Last modified

2026-06-17 01:43 UTC

Exploit probability

1.5% · EPSS, next 30 days

Weakness

CWE-22 · Path traversal

Record status

Modified

Affected

• Yealink ultra-elegant Ip Phone sip-t41p Firmware 66.83.0.35

Attack profile CVSS 3.0 · 8.0

Attack vector

Adjacent network

Complexity

Low

Privileges needed

Low

User interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Is it in your code?

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