What is CVE-2021-4183?

CVE-2021-4183 is a medium-severity software vulnerability (Out-of-bounds read) with a CVSS score of 5.5. Crash in the pcapng file parser in Wireshark 3.6.0 allows denial of service via crafted capture file

Is CVE-2021-4183 being actively exploited?

It is not currently in CISA's KEV catalog. Its EPSS exploitation probability is 1%.

What products does CVE-2021-4183 affect?

Tracked products affected include Wireshark. Check the version you run to see whether it is affected.

How do I fix CVE-2021-4183?

Apply the vendor fix in your normal patch cycle. An official patch or advisory is available. Upgrade affected products to a fixed version.

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CVE-2021-4183

MEDIUM severity · CVSS 5.5 · Out-of-bounds read

5.5CVSS MEDIUM

Summary

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

Impact & exploitability

Attack vectorLocal

Attack complexityLow

Privileges requiredNone

User interactionRequired

Confidentiality impactNone

Integrity impactNone

Availability impactHigh

Exploit probability (EPSS)1%

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

Affected products we track (1)

Wireshark

Recommendation

Apply the vendor fix in your normal patch cycle. Open any affected product above for its exact safe version.

Official patch: https://gitlab.com/wireshark/wireshark/-/issues/17755 ↗

Additional information

NVD record
https://gitlab.com/wireshark/wireshark/-/issues/17755Patch
https://www.oracle.com/security-alerts/cpuapr2022.htmlPatch
https://www.wireshark.org/security/wnpa-sec-2021-19.htmlAdvisory
https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-4183.jsonAdvisory
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/202210-04Advisory