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Fencer Intel
medium 5.5

CVE-2021-4192 json

Use After Free in vim/vim

published 4y ago modified 4mo ago also EUVD-2021-34052

cvss
5.5
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.8%
EPSS 1.8% chance of exploitation in 30 days, percentile 79%
public exploits
0
none known

Summary

vim is vulnerable to Use After Free

Patch / fix

  • vim vim/vim 8.2
  • vim Debian 14, Debian 13, Debian 12 2:8.2.3995-1

debian advisories DEBIAN-CVE-2021-4192

  • vim Ubuntu 18.04 LTS 2:8.0.1453-1ubuntu1.13
  • vim Ubuntu 20.04 LTS 2:8.1.2269-1ubuntu5.14
  • vim Ubuntu Pro 14.04 LTS 2:7.4.052-1ubuntu3.1+esm9
  • vim Ubuntu Pro 16.04 LTS 2:7.4.1689-3ubuntu1.5+esm4

ubuntu advisories UBUNTU-CVE-2021-4192

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • vim RHEL 8 2:8.0.1763-16.el8_5.4
  • vim-X11 RHEL 8 2:8.0.1763-16.el8_5.4
  • vim-common RHEL 8 2:8.0.1763-16.el8_5.4
  • vim-minimal RHEL 8 2:8.0.1763-16.el8_5.4
  • vim-enhanced RHEL 8 2:8.0.1763-16.el8_5.4
  • vim-filesystem RHEL 8 2:8.0.1763-16.el8_5.4

red hat advisories RHSA-2022:0366

  • 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-X11 AlmaLinux 8 2:8.0.1763-16.el8_5.13
  • vim-common AlmaLinux 8 2:8.0.1763-16.el8_5.13
  • vim-minimal AlmaLinux 8 2:8.0.1763-16.el8_5.13
  • vim-enhanced AlmaLinux 8 2:8.0.1763-16.el8_5.13
  • vim-filesystem AlmaLinux 8 2:8.0.1763-16.el8_5.13

almalinux advisories ALSA-2022:0366

  • vim Rocky Linux 8 2:8.0.1763-16.el8_5.4

rocky linux advisories RLSA-2022:0366

  • vim Alpine 3.24, Alpine 3.23, Alpine 3.22 +10 more 8.2.4173-r0

alpine advisories ALPINE-CVE-2021-4192

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-7085

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 8.2.4151-1
  • gvim Arch Linux 8.2.4151-1

arch linux advisories AVG-2738

Is CVE-2021-4192 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

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-2021-4192 updated cvss 7.8

vim: use-after-free in win_linetabsize()

  • 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
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux AppStream (v. 8) vim-X11 8.0.1763-16.el8_5.4, vim-common 8.0.1763-16.el8_5.4, vim-enhanced 8.0.1763-16.el8_5.4, vim-filesystem 8.0.1763-16.el8_5.4 Red Hat Enterprise Linux BaseOS (v. 8) vim 8.0.1763-16.el8_5.4, vim-minimal 8.0.1763-16.el8_5.4
    fixed: vendor fix RHSA-2022:0366
  • Red Hat Enterprise Linux 9 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

Exploit prediction

1.85% chance of exploitation in the next 30 days, higher than 79% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • huntr.dev https://huntr.dev/bounties/6dd9cb2e-a940-4093-856e-59b502429f22 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.0 5.5 CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P

Affected products

  • vim vim/vim

Classification

Weakness

References

Sources

Fencer Intel 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.