CVE-2021-4183

Name: CVE-2021-4183
Creator: NVD / NIST
Published: 2021-12-30T22:15:10.247+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10EPSS 1.43%

Last modified Jun 17, 2026

CVE-2021-4183 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. Crash in the pcapng file parser in Wireshark 3.6.0 allows denial of service via crafted capture file. EPSS estimates a 1.43% chance of exploitation in the next 30 days.

Description

Crash in the pcapng file parser in Wireshark 3.6.0 allows denial of service via crafted capture file

Metrics

CVSS 3.1

5.5/10

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

EPSS Probability

1.43%

69.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-125

Affected Software

Vendor	Product	Versions
Wireshark	Wireshark	3.6.0
Fedoraproject	Fedora	34
Fedoraproject	Fedora	35
Oracle	Http Server	12.2.1.3.0
Oracle	Http Server	12.2.1.4.0
Oracle	Zfs Storage Appliance Kit	8.8

References

https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-4183.jsonThird Party Advisory
https://gitlab.com/wireshark/wireshark/-/issues/17755Exploit, Issue Tracking, Patch, Third Party Advisory
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/202210-04Third Party Advisory
https://www.oracle.com/security-alerts/cpuapr2022.htmlPatch, Third Party Advisory
https://www.wireshark.org/security/wnpa-sec-2021-19.htmlVendor Advisory
https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-4183.jsonThird Party Advisory
https://gitlab.com/wireshark/wireshark/-/issues/17755Exploit, Issue Tracking, Patch, Third Party Advisory
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/202210-04Third Party Advisory
https://www.oracle.com/security-alerts/cpuapr2022.htmlPatch, Third Party Advisory
https://www.wireshark.org/security/wnpa-sec-2021-19.htmlVendor Advisory

Timeline

Published: Dec 30, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-4183?

Crash in the pcapng file parser in Wireshark 3.6.0 allows denial of service via crafted capture file

How severe is CVE-2021-4183?

CVE-2021-4183 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 1.43% probability of exploitation in the next 30 days.

How do I fix CVE-2021-4183?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-4183?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST