What’s Vulnerable › Vulnerabilities

CVE-2021-4182

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-12-30 · updated 2026-06-17
• Weakness: CWE-835

Description

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

Affected products

• Fedoraproject Fedora: 34, 35
• Oracle Corporation Oracle HTTP Server: 12.2.1.3.0, 12.2.1.4.0
• Oracle Corporation Oracle ZFS Storage Appliance Kit: 8.8
• Wireshark Foundation Wireshark: from 3.4.0 before 3.4.11; 3.6.0 — fixed in 3.4.11

How to fix

Upgrade to a fixed version: Wireshark Foundation Wireshark 3.4.11. Check the vendor advisory for mitigations.

References

• https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-4182.json
• https://gitlab.com/wireshark/wireshark/-/issues/17801
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Q6XGBKWSQFCVYUN4ZK3O3NJIFP3OAFVT/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/R5AEK3XTOIOGCGUILUFISMGX54YJXWGJ/
• https://security.gentoo.org/glsa/202210-04
• https://www.oracle.com/security-alerts/cpuapr2022.html
• https://www.wireshark.org/security/wnpa-sec-2021-20.html
• https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-4182.json
• https://gitlab.com/wireshark/wireshark/-/issues/17801
• https://lists.debian.org/debian-lts-announce/2024/09/msg00049.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Q6XGBKWSQFCVYUN4ZK3O3NJIFP3OAFVT/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/R5AEK3XTOIOGCGUILUFISMGX54YJXWGJ/

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