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Fencer Vulns
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 2021-12-30 4 y ago modified 2026-06-17 4 mo 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

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, 2026-11-08).

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 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.