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Fencer Intel
high 7.5

CVE-2021-4182 json

Crash in the RFC 7468 dissector in Wireshark 3.6.0 and 3.4.0 to 3.4.10 allows denial of service via packet injection or crafted capture file

published 4y ago modified 4mo ago also EUVD-2021-34042

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
3.4%
EPSS 3.4% chance of exploitation in 30 days, percentile 89%
public exploits
0
none known

Summary

Crash in the RFC 7468 dissector in Wireshark 3.6.0 and 3.4.0 to 3.4.10 allows denial of service via packet injection or crafted capture file

Patch / fix

  • wireshark wireshark 3.4.11
  • wireshark Debian 14, Debian 13, Debian 12 3.6.2-1

debian advisories DEBIAN-CVE-2021-4182

  • wireshark Ubuntu Pro 20.04 LTS 3.2.3-1ubuntu0.1~esm2

ubuntu advisories UBUNTU-CVE-2021-4182

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

  • wireshark SLES for SAP 15 SP2, SLES for SAP 15 SP1, SLES for SAP 15 +18 more 3.6.1-3.68.1
  • libvirt SLE Module for Server Applications 15 SP3, SLE Module for Basesystem 15 SP3, SLE Micro 5.1 7.1.0-150300.6.23.1

suse advisories SUSE-SU-2022:0375-1

  • wireshark openSUSE Tumbleweed 3.6.1-1.1
  • wireshark openSUSE Leap 15.3 3.6.1-3.68.1
  • libvirt openSUSE Leap 15.3 7.1.0-150300.6.23.1

opensuse advisories openSUSE-SU-2024:11703-1openSUSE-SU-2022:0375-1

  • wireshark Alpine 3.15 3.4.13-r0
  • wireshark Alpine 3.24, Alpine 3.23, Alpine 3.22 +6 more 3.4.11-r0

alpine advisories ALPINE-CVE-2021-4182

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

  • wireshark CBL-Mariner 2.0 3.4.14-1

azure linux advisories AZL-7418

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

Is CVE-2021-4182 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.

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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-2021-4182 updated cvss 7.5

wireshark: RFC 7468 file parser infinite loop

  • Red Hat Enterprise Linux 9 wireshark, wireshark-cli
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux 6 wireshark, wireshark-gnome Red Hat Enterprise Linux 7 wireshark, wireshark-gnome Red Hat Enterprise Linux 8 wireshark, wireshark-cli
    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

3.45% chance of exploitation in the next 30 days, higher than 89% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • gitlab.com https://gitlab.com/wireshark/wireshark/-/issues/17801 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Affected products

  • Wireshark Foundation Wireshark

Classification

Weakness
  • CWE-835 Loop with Unreachable Exit Condition

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.