No exploitation reportedFix available

CVE-2021-4184

No exploitation reported by the sources we read.

Published2021-12-30
WeaknessCWE-835

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

Infinite loop in the BitTorrent DHT 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

Timeline

dates in UTC

2021-12-3022:15CVE publishedNVD

Versions per branch

NVD

Wireshark

Branch	Affected	Fixed in	Source
3.4	≥ 3.4.0, ≤ 3.4.10	no fix published	NVD
3.6	= 3.6.0	no fix published	NVD

Fedoraproject fedora

Branch	Affected	Fixed in	Source
34.x	= 34	no fix published	NVD
35.x	= 35	no fix published	NVD

Oracle http server

Branch	Affected	Fixed in	Source
12.2	= 12.2.1.3.0	no fix published	NVD
12.2	= 12.2.1.4.0	no fix published	NVD

2 more products in the sources.

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

libvirtSUSE:Linux Enterprise Module for Server Applications 15 SP3all versions · fixed in 7.1.0-150300.6.23.1
libvirtSUSE:Linux Enterprise Module for Basesystem 15 SP3all versions · fixed in 7.1.0-150300.6.23.1
libvirtSUSE:Linux Enterprise Micro 5.1all versions · fixed in 7.1.0-150300.6.23.1
libvirtopenSUSE:Leap 15.3all versions · fixed in 7.1.0-150300.6.23.1
wiresharkTuxCare:AlmaLinux:9.2all versions · fixed in 1:3.4.10-4.el9.tuxcare.els7and 2 other packages
wiresharkSUSE:Manager Server 4.1all versions · fixed in 3.6.1-3.68.1
wiresharkSUSE:Manager Retail Branch Server 4.1all versions · fixed in 3.6.1-3.68.1
wiresharkSUSE:Manager Proxy 4.1all versions · fixed in 3.6.1-3.68.1

38 more package ranges on OSV.dev

Vendor advisories

CVE-2021-4184 Red Hat Product Security4 known affected
wireshark: BitTorrent DHT dissector infinite loop
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

No fix planned, says the vendor Red Hat Product Security CVE-2021-4184 · 4 productsWill not fix

Advisories and patches

www.wireshark.orgVendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof of concept: PoC-in-GitHubno public repository identifiedread 2026-11-08
Metasploit modules: none listed

Sources

CNACVSS 3.17.5known since 2026-10-23
NVDCVSS 3.17.5read 2026-10-23
NVDCVSS 2.05read 2026-10-23
NVDweakness (CWE)CWE-835read 2026-10-23
FIRST EPSSEPSS score4.1 %2026-11-08
OSVaffected packages—
GitHub Advisoriesadvisory—

Identifiers

AZL-7419same flawAzure Linux · MIT
EUVD-2021-34044same flawENISA EUVD · LicenseRef-ENISA-legal-notice
GHSA-g3fh-c7h3-x56jsame flawGitHub Advisory Database · CC-BY-4.0
DLA-2967-1advisory covering several CVEsDebian · LicenseRef-unstated
DLA-3906-1advisory covering several CVEsDebian · LicenseRef-unstated
MGASA-2022-0004advisory covering several CVEsMageia · LicenseRef-unstated
openSUSE-SU-2022:0375-1advisory covering several CVEsopenSUSE · LicenseRef-unstated
openSUSE-SU-2024:11703-1advisory covering several CVEsopenSUSE · LicenseRef-unstated
SUSE-SU-2022:0375-1advisory covering several CVEsSUSE · LicenseRef-unstated

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-g3fh-c7h3-x56j

Frequently asked questions

What is CVE-2021-4184?

Infinite loop in the BitTorrent DHT 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

Is CVE-2021-4184 actively exploited?

Active exploitation of CVE-2021-4184 has not been confirmed. Its EPSS score was 4.1% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-4184?

CVE-2021-4184 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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