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No exploitation reportedFix available

CVE-2021-4186

No exploitation reported by the sources we read.

  • Published2021-12-30
  • WeaknessCWE-476

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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

Timeline

dates in UTC
  1. 2021-12-3022:15CVE publishedNVD

Versions per branch

NVD
Wireshark
BranchAffectedFixed in
3.4≥ 3.4.0, ≤ 3.4.10no fix published
Fedoraproject fedora
BranchAffectedFixed in
34.x= 34no fix published
35.x= 35no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • wiresharkUbuntu:Pro:22.04:LTSall versions · fixed in 3.6.2-2ubuntu0.1~esm1
  • wiresharkUbuntu:Pro:20.04:LTSall versions · fixed in 3.2.3-1ubuntu0.1~esm2
  • wiresharkUbuntu:Pro:18.04:LTSall versions · fixed in 2.6.10-1~ubuntu18.04.0+esm2
  • wiresharkUbuntu:Pro:16.04:LTSall versions · fixed in 2.6.10-1~ubuntu16.04.0+esm2
  • wiresharkUbuntu:Pro:14.04:LTSall versions · fixed in 2.6.10-1~ubuntu14.04.0~esm3
  • wiresharkTuxCare:AlmaLinux:9.2all versions · fixed in 1:3.4.10-4.el9.tuxcare.els7and 2 other packages
  • wiresharkSUSE:Linux Enterprise Module for Desktop Applications 15 SP4all versions · fixed in 3.6.8-150000.3.74.1
  • wiresharkSUSE:Linux Enterprise Module for Desktop Applications 15 SP3all versions · fixed in 3.6.8-150000.3.74.1

22 more package ranges on OSV.dev

Vendor advisories

  • CVE-2021-4186 Red Hat Product Security4 known affected

    wireshark: Gryphon dissector crash

    wireshark as a component of Red Hat Enterprise Linux 9 · wireshark-cli as a component of Red Hat Enterprise Linux 9 · wireshark-devel as a component of Red Hat Enterprise Linux 9 · +1 more

Full record on NVD

Fix

  1. No fix planned, says the vendor Red Hat Product Security CVE-2021-4186 · 4 productsWill not fix

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • CNACVSS 3.16.3known since 2026-10-23
  • NVDCVSS 3.17.5read 2026-10-23
  • NVDCVSS 2.05read 2026-10-23
  • NVDweakness (CWE)CWE-476read 2026-10-23
  • FIRST EPSSEPSS score2.3 %2026-11-08
  • OSVaffected packages—
  • GitHub Advisoriesadvisory—

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2021-12-30
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-7c4g-8373-rcp3

Frequently asked questions

What is CVE-2021-4186?

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

Is CVE-2021-4186 actively exploited?

Active exploitation of CVE-2021-4186 has not been confirmed. Its EPSS score was 2.3% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-4186?

CVE-2021-4186 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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