HOMEVULNERABILITIESCVE-2018-16221
HIGH

CVE-2018-16221

CWE-22Published: May 29, 2019· Updated: Jun 17, 2026

8.0
CVSS v3.1

Official 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).

NVD Source

Technical Analysis

CVE-2018-16221 requires adjacent network access, limiting remote exploitation but still posing risk in shared or local network environments.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 8.0.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorAdjacent
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.0/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

yealink2 product(s)
ultra-elegant ip phone sip-t41p firmwareultra-elegant ip phone sip-t41p
Source: NVD CPE · 2 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://www.sit.fraunhofer.de/de/securitytestlab/
ADVISORYhttps://www.sit.fraunhofer.de/fileadmin/dokumente/CVE/Advisory_Yealink_Ultra-elegantIPPhone_SIPT41P.pdf?_=1549375271
ADVISORYhttps://www.sit.fraunhofer.de/de/securitytestlab/
ADVISORYhttps://www.sit.fraunhofer.de/fileadmin/dokumente/CVE/Advisory_Yealink_Ultra-elegantIPPhone_SIPT41P.pdf?_=1549375271

All References (4)

→
https://www.sit.fraunhofer.de/de/securitytestlab/Third Party Advisory
→
https://www.sit.fraunhofer.de/fileadmin/dokumente/CVE/Advisory_Yealink_Ultra-elegantIPPhone_SIPT41P.pdf?_=1549375271Third Party Advisory
→
https://www.sit.fraunhofer.de/de/securitytestlab/Third Party Advisory
→
https://www.sit.fraunhofer.de/fileadmin/dokumente/CVE/Advisory_Yealink_Ultra-elegantIPPhone_SIPT41P.pdf?_=1549375271Third Party Advisory

Quick Facts

CVE IDCVE-2018-16221
CVSS Score8.0 / 10
SeverityHIGH
WeaknessCWE-22
CISA KEVNo
Affected1 vendor(s)
PublishedMay 29, 2019

Related CVEs (CWE-22)

CVE-2011-2653
10.0
CVE-2010-5324
10.0
CVE-2011-5127
10.0
CVE-2013-6221
10.0
CVE-2015-0779
10.0
CVE-2010-5323
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2018-16221 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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