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CVE-2021-4166

27
FAUCET Score

CVE-2021-4166 is an out-of-bounds read vulnerability affecting Vim and various distributions including Apple, Debian, Fedora, openSUSE, Red Hat, and SUSE. This high-severity vulnerability (CVSS 7.1) can be triggered locally with user interaction, potentially leading to high confidentiality and availability impacts. Despite its severity, there is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
< 8.2.3884CPE matchmatch criteria
cpe:2.3:a:vim:vim:*:*:*:*:*:*:*:*
8.0CPE matchmatch criteria
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:a:opensuse:factory:-:*:*:*:*:*:*:*
12.0CPE matchmatch criteria
cpe:2.3:o:suse:linux_enterprise:12.0:*:*:*:*:*:*:*
15.0CPE matchmatch criteria
cpe:2.3:o:suse:linux_enterprise:15.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.1HIGH

CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
1.8
Impact Score
5.2
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.59%
Probability of exploitation in next 30 days
EPSS Percentile
73.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0159 is in the 72nd percentile among its peer group of 11,616 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 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 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (11)

github_advisorypatch availablevia nvd_reference
View patch
microsoftpatch availablevia msrc
Product: 18930-16820Fixed in: 8.2.4006-1
microsoftpatch availablevia msrc
Product: 18812-16823Fixed in: 8.2.4081-1
microsoftpatch availablevia msrc
Product: CBL Mariner 2.0 ARMFixed in: 8.2.4081-1
microsoftpatch availablevia msrc
Product: CBL Mariner 1.0 ARMFixed in: 8.2.4006-1
microsoftpatch availablevia msrc
Product: CBL Mariner 2.0 x64Fixed in: 8.2.4081-1
microsoftpatch availablevia msrc
Product: cm1 vim 8.2.4006-1 on CBL Mariner 1.0Fixed in: 8.2.4006-1
microsoftpatch availablevia msrc
Product: cbl2 vim 8.2.4081-1 on CBL Mariner 2.0Fixed in: 8.2.4081-1
microsoftpatch availablevia msrc
Product: CBL Mariner 1.0 x64Fixed in: 8.2.4006-1
redhatvendor investigatingvia redhat_api
Product: Red Hat Enterprise Linux 9Fixed in: vim
redhatvendor investigatingvia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: vim

Vendor Advisories (3)

microsoft2022-Jan/CVE-2021-4166

CVE-2021-4166

Jan 11, 2022
redhatCVE-2021-4166Low

vim: out-of-bounds read in do_arg_all() in src/arglist.c

Dec 25, 2021
microsoft2021-Dec/CVE-2021-4166Important

Out-of-bounds Read in vim/vim

Dec 14, 2021

References

seclists.org / fulldisclosure/2022/Jul/14
Mailing ListThird Party Advisory
seclists.org / fulldisclosure/2022/Mar/29
Mailing ListThird Party Advisory
seclists.org / fulldisclosure/2022/May/35
Mailing ListThird Party Advisory
github.com / vim/vim/commit/6f98371532fcff911b462d51bc64f2ce8a6ae682
PatchThird Party Advisory
huntr.dev / bounties/229df5dd-5507-44e9-832c-c70364bdf035
ExploitIssue TrackingPatchThird Party Advisory
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/2EY2VFBU3YGGWI5BW4XKT3F37MYGEQUD
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/3FH2J57GDA2WMBS6J56F6QQRA6BXQQFZ
security.gentoo.org / glsa/202208-32
Third Party Advisory
support.apple.com / kb/HT213183
Release NotesThird Party Advisory
support.apple.com / kb/HT213256
Third Party Advisory
support.apple.com / kb/HT213343
Third Party Advisory
openwall.com / lists/oss-security/2022/01/15/1
Mailing ListThird Party Advisory