CVE-2021-4166

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

• ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

1.69% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 76.7% of scored records. A rank, not a probability.

NVD base score

7.1 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Modified. NVD last modified this record on 2026-10-08.

Red Hat severity

Low. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2021-12-25 18:15Z4 YR AGO

Last updated

2026-10-08 20:53Z20 DAYS AGO

Reserved

2021-12-24

Assigning CNA

@huntrdev

Record state

PUBLISHED

Severity

High (CVSS 7.1)

CNA CVSS vector

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

Weaknesses

• CWE-125Out-of-bounds ReadBase

Data version

5.2

Document digest

9164a20bdfac666bfb076e3166ee54806b8ac3350e71a57a970bff7f6ecb0596

• huntr.devhttps://huntr.dev/bounties/229df5dd-5507-44e9-832c-c70364bdf035x_refsource_CONFIRM
• github.comhttps://github.com/vim/vim/commit/6f98371532fcff911b462d51bc64f2ce8a6ae682x_refsource_MISC
• lists.fedoraproject.orgFEDORA-2022-a3d70b50f0https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2EY2VFBU3YGGWI5BW4XKT3F37MYGEQUD/vendor-advisoryx_refsource_FEDORA
• www.openwall.com[oss-security] 20220114 Re: 3 new CVE's in vimhttp://www.openwall.com/lists/oss-security/2022/01/15/1mailing-listx_refsource_MLIST
• lists.fedoraproject.orgFEDORA-2022-48b86d586fhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3FH2J57GDA2WMBS6J56F6QQRA6BXQQFZ/vendor-advisoryx_refsource_FEDORA
• support.apple.comhttps://support.apple.com/kb/HT213183x_refsource_CONFIRM
• seclists.org20220314 APPLE-SA-2022-03-14-4 macOS Monterey 12.3http://seclists.org/fulldisclosure/2022/Mar/29mailing-listx_refsource_FULLDISC
• support.apple.comhttps://support.apple.com/kb/HT213256x_refsource_CONFIRM
• seclists.org20220516 APPLE-SA-2022-05-16-3 macOS Big Sur 11.6.6http://seclists.org/fulldisclosure/2022/May/35mailing-listx_refsource_FULLDISC
• support.apple.comhttps://support.apple.com/kb/HT213343x_refsource_CONFIRM
• seclists.org20220721 APPLE-SA-2022-07-20-4 Security Update 2022-005 Catalinahttp://seclists.org/fulldisclosure/2022/Jul/14mailing-listx_refsource_FULLDISC
• security.gentoo.orgGLSA-202208-32https://security.gentoo.org/glsa/202208-32vendor-advisoryx_refsource_GENTOO