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CVE-2018-16221 Details

Description

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).

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:8 HIGHVector:CVSS:3.0/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://www.sit.fraunhofer.de/de/securitytestlab/	CVE	Third Party Advisory
https://www.sit.fraunhofer.de/fileadmin/dokumente/CVE/Advisory_Yealink_Ultra-elegantIPPhone_SIPT41P.pdf?_=1549375271	CVE	Third Party Advisory
https://www.sit.fraunhofer.de/de/securitytestlab/	[email protected]	Third Party Advisory
https://www.sit.fraunhofer.de/fileadmin/dokumente/CVE/Advisory_Yealink_Ultra-elegantIPPhone_SIPT41P.pdf?_=1549375271	[email protected]	Third Party Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-22	Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')	[email protected]

Affected Products

Product	Versions
yealink ultra-elegant ip phone sip-t41p firmware	66.83.0.35
CPE cpe:2.3:o:yealink:ultra-elegant_ip_phone_sip-t41p_firmware:66.83.0.35:::::::* Remediation No remediation found in references.
yealink ultra-elegant ip phone sip-t41p	All versions
CPE cpe:2.3:h:yealink:ultra-elegant_ip_phone_sip-t41p:-:::::::* Remediation No remediation found in references.

Change History

4 change records found show changes

Date	Action	Recorded By
Jun 17, 2026	CVE Modified	[email protected]
Nov 21, 2024	CVE Modified	CVE
May 14, 2024	CVE Modified	[email protected]
May 30, 2019	Initial Analysis	[email protected]