CVE-2021-4186 — NULL Pointer Dereference in Wireshark

CWE-476 — NULL Pointer DereferenceCWE-20 — Improper Input ValidationCWE-74 — Injection8 documents8 sources
Severity
7.5HIGHNVD
CNA6.3
EPSS
0.1%
top 67.82%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
3
WiresharkWireshark Foundation WiresharkFedoraproject Fedora
Timeline
PublishedDec 30
Latest updateJun 4

Description

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

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HExploitability: 3.9 | Impact: 3.6

Affected Packages3 packages

▶Debianwireshark/wireshark< 3.4.16-0+deb11u1+3
▶NVDwireshark/wireshark3.4.0 — 3.4.10
▶CVEListV5wireshark_foundation/wireshark>=3.4.0, <3.4.10

Also affects: Fedora 34, 35

🔴Vulnerability Details

3
GHSA
GHSA-7c4g-8373-rcp3: Crash in the Gryphon dissector in Wireshark 3↗2021-12-31
▶
CVEList
CVE-2021-4186: Crash in the Gryphon dissector in Wireshark 3↗2021-12-30
▶
OSV
CVE-2021-4186: Crash in the Gryphon dissector in Wireshark 3↗2021-12-30
▶

📋Vendor Advisories

4
Ubuntu
Wireshark vulnerabilities↗2025-06-04
▶
Red Hat
wireshark: Gryphon dissector crash↗2021-12-29
▶
Microsoft
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↗2021-12-14
▶
Debian
CVE-2021-4186: wireshark - Crash in the Gryphon dissector in Wireshark 3.4.0 to 3.4.10 allows denial of ser...↗2021
▶
CVE-2021-4186 — NULL Pointer Dereference in Wireshark | cvebase