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Fencer Vulns
high 8.0

CVE-2021-3968 json

Heap-based Buffer Overflow in vim/vim

published 2021-11-19 4 y ago modified 2026-10-08 31 d ago also EUVD-2021-27173

cvss
8.0
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
2.3%
EPSS 2.3% chance of exploitation in 30 days, percentile 83%
public exploits
0
none known

Summary

vim is vulnerable to Heap-based Buffer Overflow

Patch / fix

  • vim vim/vim 8.2.3610
  • vim Debian 14, Debian 13, Debian 12 2:8.2.3995-1

debian advisories DEBIAN-CVE-2021-3968

  • vim SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES 12 SP5 +5 more 9.0.0814-17.9.1
  • vim SLES for SAP 15 SP2, SLES for SAP 15 SP1, SLES for SAP 15 +24 more 8.2.5038-150000.5.21.1

suse advisories SUSE-SU-2022:4619-1SUSE-SU-2022:2102-1

  • vim Alpine 3.24, Alpine 3.23, Alpine 3.22 +10 more 8.2.3650-r0

alpine advisories ALPINE-CVE-2021-3968

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • vim CBL-Mariner 2.0 8.2.4081-1

azure linux advisories AZL-6945

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

  • vim Arch Linux 8.2.3741-1
  • gvim Arch Linux 8.2.3741-1

arch linux advisories AVG-2572

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-3968 updated cvss 2.9

vim: Heap use-after-free in ml_append_int function

  • Red Hat Enterprise Linux 9 vim, vim-X11, vim-common, vim-minimal, vim-enhanced, vim-filesystem
    affected: workaround, no fix available “Do not run untrusted vim scripts with -s {scriptin} as it is never safe to do so.”
  • Red Hat OpenShift AI (RHOAI) rhoai/odh-dashboard-rhel9
    under investigation
  • Red Hat Advanced Cluster Management for Kubernetes 2 rhacm2/openshift-hive-rhel8 Red Hat Enterprise Linux 6 vim, vim-X11, vim-common, vim-minimal, vim-enhanced, vim-filesystem Red Hat Enterprise Linux 7 vim, vim-X11, vim-common, vim-minimal, vim-enhanced, vim-filesystem Red Hat Enterprise Linux 8 vim, vim-X11, vim-common, vim-minimal, vim-enhanced, vim-filesystem
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
31 d ago

Exploit prediction

2.25% chance of exploitation in the next 30 days, higher than 83% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • huntr.dev https://huntr.dev/bounties/00d62924-a7b4-4a61-ba29-acab2eaa1528 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.0 8.0 CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
NVD 3.1 8.0 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
NVD 2.0 8.5 AV:N/AC:M/Au:S/C:C/I:C/A:C

Affected products

  • vim vim/vim

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.