CVE-2021-4185

Name: CVE-2021-4185
Creator: NVD / NIST
Published: 2021-12-30T22:15:10.363+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 3.88%

Last modified Jun 17, 2026

CVE-2021-4185 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Infinite loop in the RTMPT 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. EPSS estimates a 3.88% chance of exploitation in the next 30 days.

Description

Infinite loop in the RTMPT 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

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

3.88%

88.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-835

Affected Software

Vendor	Product	Versions
Wireshark	Wireshark	>= 3.4.0, < 3.4.11
Wireshark	Wireshark	3.6.0
Fedoraproject	Fedora	34
Fedoraproject	Fedora	35
Debian	Debian Linux	9.0
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-2021-4185.jsonThird Party Advisory
https://gitlab.com/wireshark/wireshark/-/issues/17745Exploit, Issue Tracking, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/03/msg00041.htmlMailing List, 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.htmlThird Party Advisory
https://www.wireshark.org/security/wnpa-sec-2021-17.htmlVendor Advisory
https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-4185.jsonThird Party Advisory
https://gitlab.com/wireshark/wireshark/-/issues/17745Exploit, Issue Tracking, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/03/msg00041.htmlMailing List, Third Party Advisory
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/
https://security.gentoo.org/glsa/202210-04Third Party Advisory
https://www.oracle.com/security-alerts/cpuapr2022.htmlThird Party Advisory
https://www.wireshark.org/security/wnpa-sec-2021-17.htmlVendor Advisory

Timeline

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

Frequently Asked Questions

What is CVE-2021-4185?

Infinite loop in the RTMPT 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

How severe is CVE-2021-4185?

CVE-2021-4185 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 3.88% probability of exploitation in the next 30 days.

How do I fix CVE-2021-4185?

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-2021-4185?

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

Scan your code now

Source: NVD / NIST