No exploitation reported

CVE-2018-16221

No exploitation reported by the sources we read.

Published2019-05-29
WeaknessCWE-22

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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).

Timeline

dates in UTC

2019-05-2918:29CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2018-16221?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2018-16221?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Yealink ultra-elegant ip phone sip-t41p firmwareversion to verify

Branch	Affected	Fixed in	Source
66.83	= 66.83.0.35	no fix published	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

No fix published by the sources we read yet. NVD record

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.08read 2026-10-23
NVDCVSS 2.07.7read 2026-10-23
NVDweakness (CWE)CWE-22read 2026-10-23
FIRST EPSSEPSS score1.5 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.0/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published: 2019-05-29
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2018-16221?

Is CVE-2018-16221 actively exploited?

Active exploitation of CVE-2018-16221 has not been confirmed. Its EPSS score was 1.5% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2018-16221?

CVE-2018-16221 has a CVSS v3 base score of 8 (HIGH severity), with vector string CVSS:3.0/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

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