7.5
CWE
834
Advisory Published
Updated

CVE-2021-39923

First published: Fri Nov 19 2021(Updated: )

Large loop in the PNRP dissector in Wireshark 3.4.0 to 3.4.9 and 3.2.0 to 3.2.17 allows denial of service via packet injection or crafted capture file

Credit: cve@gitlab.com

Affected SoftwareAffected VersionHow to fix
debian/wireshark
2.6.20-0+deb10u4
2.6.20-0+deb10u7
3.4.10-0+deb11u1
4.0.6-1~deb12u1
4.0.10-1
Wireshark Wireshark>=3.2.0<=3.2.17
Wireshark Wireshark>=3.4.0<=3.4.9
Debian Debian Linux=10.0
Debian Debian Linux=11.0
Debian Debian Linux=9.0

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Frequently Asked Questions

  • What is CVE-2021-39923?

    CVE-2021-39923 is a vulnerability in the PNRP dissector in Wireshark versions 3.4.0 to 3.4.9 and 3.2.0 to 3.2.17 that allows denial of service through packet injection or crafted capture file.

  • How can this vulnerability be exploited?

    This vulnerability can be exploited by sending specially crafted packets or by using a manipulated capture file to cause a denial of service on a vulnerable system.

  • What is the severity of CVE-2021-39923?

    CVE-2021-39923 has a severity rating of 7.5 (high).

  • Which versions of Wireshark are affected by CVE-2021-39923?

    Wireshark versions 3.4.0 to 3.4.9 and 3.2.0 to 3.2.17 are affected by CVE-2021-39923.

  • How do I fix CVE-2021-39923?

    To fix CVE-2021-39923, it is recommended to update to the latest version of Wireshark (4.0.10-1 or later) or apply the provided patches and security updates from the official sources.

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