Vulnerability Description
NULL pointer exception in the Modbus 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
CVSS Score
7.5
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Wireshark | Wireshark | >= 3.2.0, <= 3.2.17 |
| Fedoraproject | Fedora | 34 |
| Debian | Debian Linux | 9.0 |
Related Weaknesses (CWE)
References
- https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39921.jsonThird Party Advisory
- https://gitlab.com/wireshark/wireshark/-/issues/17703ExploitIssue TrackingPatch
- https://lists.debian.org/debian-lts-announce/2021/12/msg00015.htmlMailing ListThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://security.gentoo.org/glsa/202210-04Third Party Advisory
- https://www.debian.org/security/2021/dsa-5019Third Party Advisory
- https://www.wireshark.org/security/wnpa-sec-2021-14.htmlVendor Advisory
- https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39921.jsonThird Party Advisory
- https://gitlab.com/wireshark/wireshark/-/issues/17703ExploitIssue TrackingPatch
- https://lists.debian.org/debian-lts-announce/2021/12/msg00015.htmlMailing ListThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://security.gentoo.org/glsa/202210-04Third Party Advisory
- https://www.debian.org/security/2021/dsa-5019Third Party Advisory
FAQ
What is CVE-2021-39921?
CVE-2021-39921 is a vulnerability with a CVSS score of 7.5 (HIGH). NULL pointer exception in the Modbus 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
How severe is CVE-2021-39921?
CVE-2021-39921 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-39921?
Check the references section above for vendor advisories and patch information. Affected products include: Wireshark Wireshark, Fedoraproject Fedora, Debian Debian Linux.