CVE-2021-4186: Null Pointer Dereference
First published: Thu Dec 30 2021(Updated: )
Crash in the Gryphon dissector in Wireshark 3.4.0 to 3.4.10 allows denial of service via packet injection or crafted capture file
Credit: cve@gitlab.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Wireshark Wireshark | >=3.4.0<=3.4.10 | |
| Fedoraproject Fedora | =34 | |
| Fedoraproject Fedora | =35 |
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Reference Links
- https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-4186.json
- https://gitlab.com/wireshark/wireshark/-/issues/17737
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/2EY2VFBU3YGGWI5BW4XKT3F37MYGEQUD/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3FH2J57GDA2WMBS6J56F6QQRA6BXQQFZ/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/Q6XGBKWSQFCVYUN4ZK3O3NJIFP3OAFVT/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/R5AEK3XTOIOGCGUILUFISMGX54YJXWGJ/
- https://security.gentoo.org/glsa/202210-04
- https://www.wireshark.org/security/wnpa-sec-2021-16.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2EY2VFBU3YGGWI5BW4XKT3F37MYGEQUD/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/R5AEK3XTOIOGCGUILUFISMGX54YJXWGJ/
- 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/3FH2J57GDA2WMBS6J56F6QQRA6BXQQFZ/
Frequently Asked Questions
What is CVE-2021-4186?
CVE-2021-4186 is a vulnerability in Wireshark 3.4.0 to 3.4.10 that allows denial of service through packet injection or crafted capture file.
How does CVE-2021-4186 affect Wireshark?
CVE-2021-4186 affects Wireshark versions 3.4.0 to 3.4.10 by causing a crash in the Gryphon dissector and allowing denial of service.
What is the severity of CVE-2021-4186?
CVE-2021-4186 has a severity rating of 7.5 out of 10, indicating a high level of threat.
How can denial of service occur through CVE-2021-4186?
Denial of service can occur through CVE-2021-4186 by exploiting the vulnerability in the Gryphon dissector in Wireshark, either through packet injection or using a crafted capture file.
Is there a fix available for CVE-2021-4186?
Yes, updating Wireshark to a version beyond 3.4.10 will fix the vulnerability CVE-2021-4186.
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- canonical/wireshark wireshark
- version/wireshark wireshark/3.4.0
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- vendor/fedoraproject
- canonical/fedoraproject fedora
- version/fedoraproject fedora/34
- version/fedoraproject fedora/35