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CVE-2021-38165

22
FAUCET Score

CVE-2021-38165 describes a vulnerability in Lynx versions through 2.8.9 where mishandling of the userinfo subcomponent in a URI can expose cleartext credentials within SNI data. This medium-severity vulnerability (CVSS 5.3) primarily affects Lynx on Debian and Fedora, allowing remote attackers to discover sensitive information with high confidentiality impact, though it requires user interaction and a high attack complexity. Currently, there is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 2.8.9CPE matchmatch criteria
cpe:2.3:a:lynx_project:lynx:*:*:*:*:*:*:*:*
9.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
10.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
33CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
34CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.3MEDIUM

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
1.6
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
4.07%
Probability of exploitation in next 30 days
EPSS Percentile
89.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0407 is in the 92nd percentile among its peer group of 707 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.2 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.2 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: lynx-0:2.8.9-4.el8
View patch

Vendor Advisories (1)

redhatCVE-2021-38165Moderate

lynx: Disclosure of HTTP authentication credentials via SNI data

Aug 7, 2021

References

bugs.debian.org / 991971
Issue TrackingThird Party Advisory
github.com / w3c/libwww/blob/f010b4cc58d32f34b162f0084fe093f7097a61f0/Library/src/HTParse.c
Third Party Advisory
lists.debian.org / debian-lts-announce/2021/08/msg00010.html
Mailing ListThird Party Advisory
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/7YMUHFJJWTZ6HBHTYXVDPNZINGGURHDW
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/K6PZF7JNTFCOJ62HXZG4Q2NEHSZ6IO2V
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/VKNK7GQBJBUBMJVNKVC7RTCYWUYMFJQW
lynx.invisible-island.net / current/CHANGES.html
Release NotesThird Party Advisory
debian.org / security/2021/dsa-4953
Third Party Advisory
openwall.com / lists/oss-security/2021/08/07/1
Mailing ListThird Party Advisory
openwall.com / lists/oss-security/2021/08/07/11
Mailing List
openwall.com / lists/oss-security/2021/08/07/11
Mailing ListThird Party Advisory
openwall.com / lists/oss-security/2021/08/07/12
Mailing ListThird Party Advisory
openwall.com / lists/oss-security/2021/08/07/9
Mailing ListThird Party Advisory