CVE-2021-39921
HighPublic PoC
Published: 19 November 2021
Published
19 November 2021
Modified
21 November 2024
KEV Added
—
Patch
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CVSS Score v3.1
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS Score
0.0133
80.4th percentile
Risk Priority
16
60% EPSS · 20% KEV · 20% CVSS
Summary
CVE-2021-39921 is a high-severity NULL Pointer Dereference (CWE-476) vulnerability in Wireshark Wireshark. Its CVSS base score is 7.5 (High).
Operationally, ranked in the top 19.6% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2021-26277
Vulnerability details
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
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
wireshark
wireshark
3.2.0 — 3.2.17 · 3.4.0 — 3.4.9
fedoraproject
fedora
34, 35
debian
debian linux
9.0
Mitigating Controls
No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.