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Fencer Intel
medium 6.3

CVE-2021-4186 json

Crash in the Gryphon dissector in Wireshark 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-2021-34046

cvss
6.3
version 3.1, 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

Crash in the Gryphon dissector in Wireshark 3.4.0 to 3.4.10 allows denial of service via packet injection or crafted capture file

Patch / fix

  • wireshark Debian 14, Debian 13, Debian 12 3.6.0-1

debian advisories DEBIAN-CVE-2021-4186

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

ubuntu advisories UBUNTU-CVE-2021-4186

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 SLE Module for Desktop Applications 15 SP4, SLE Module for Desktop Applications 15 SP3, SLE Module for Basesystem 15 SP4 +3 more 3.6.8-150000.3.74.1

suse advisories SUSE-SU-2022:3309-1

  • wireshark openSUSE Tumbleweed 3.6.8-2.1

opensuse advisories openSUSE-SU-2024:12329-1

  • 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-2021-4186

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-7421

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-2021-4186 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-2021-4186 updated cvss 6.5

wireshark: Gryphon dissector crash

  • 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

2.31% chance of exploitation in the next 30 days, higher than 83% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • gitlab.com https://gitlab.com/wireshark/wireshark/-/issues/17737 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 6.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
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

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.