High severity7.5NVD Advisory· Published Nov 19, 2021· Updated Jun 17, 2026
CVE-2021-39921
CVE-2021-39921
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
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
13cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*
- osv-coords7 versionspkg:rpm/opensuse/wireshark&distro=openSUSE%20Leap%2015.2pkg:rpm/opensuse/wireshark&distro=openSUSE%20Leap%2015.3pkg:rpm/opensuse/wireshark&distro=openSUSE%20Tumbleweedpkg:rpm/suse/wireshark&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP3pkg:rpm/suse/wireshark&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP2pkg:rpm/suse/wireshark&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Desktop%20Applications%2015%20SP2pkg:rpm/suse/wireshark&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Desktop%20Applications%2015%20SP3
< 3.4.10-lp152.2.21.1+ 6 more
- (no CPE)range: < 3.4.10-lp152.2.21.1
- (no CPE)range: < 3.4.10-3.62.1
- (no CPE)range: < 3.4.10-1.1
- (no CPE)range: < 3.4.10-3.62.1
- (no CPE)range: < 3.4.10-3.62.1
- (no CPE)range: < 3.4.10-3.62.1
- (no CPE)range: < 3.4.10-3.62.1
Patches
Vulnerability mechanics
References
8- gitlab.com/wireshark/wireshark/-/issues/17703nvdExploitIssue TrackingPatchThird Party Advisory
- gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39921.jsonnvdThird Party Advisory
- lists.debian.org/debian-lts-announce/2021/12/msg00015.htmlnvdMailing ListThird Party Advisory
- security.gentoo.org/glsa/202210-04nvdThird Party Advisory
- www.debian.org/security/2021/dsa-5019nvdThird Party Advisory
- www.wireshark.org/security/wnpa-sec-2021-14.htmlnvdVendor Advisory
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/A6AJFIYIHS3TYDD2EBYBJ5KKE52X34BJ/nvd
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YEWTIRMC2MFQBZ2O5M4CJHJM4JPBHLXH/nvd
News mentions
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