CVE-2021-3968

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 ImpacttotalSuccessful exploitation gives total 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

2.25% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 82.8% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

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

2021-11-19 11:40Z4 YR AGO

Last updated

2026-10-08 21:14Z20 DAYS AGO

Reserved

2021-11-17

Assigning CNA

@huntrdev

Record state

PUBLISHED

Severity

High (CVSS 8.0)

CNA CVSS vector

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

Weaknesses

• CWE-122Heap-based Buffer OverflowVariant
• CWE-787Out-of-bounds WriteBase
• CWE-119Improper Restriction of Operations within the Bounds of a Memory BufferClass

Data version

5.2

Document digest

162c2a317825d7e723b822bc4449a3e0b60a15abb5bd071327dc2ca1fc0471cf

• huntr.devhttps://huntr.dev/bounties/00d62924-a7b4-4a61-ba29-acab2eaa1528x_refsource_CONFIRM
• github.comhttps://github.com/vim/vim/commit/a062006b9de0b2947ab5fb376c6e67ef92a8cd69x_refsource_MISC
• lists.fedoraproject.orgFEDORA-2021-5cd9df120ehttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IH2LS2DXBTYOCWGAKFMBF3HTWWXPBEFL/vendor-advisoryx_refsource_FEDORA
• lists.fedoraproject.orgFEDORA-2021-b0ac29efb1https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FNXY7T5OORA7UJIMGSJBGHFMU6UZWS6P/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
• security.gentoo.orgGLSA-202208-32https://security.gentoo.org/glsa/202208-32vendor-advisoryx_refsource_GENTOO