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CVE Vulnerabilities

CVE-2021-4186

NULL Pointer Dereference

Published: Dec 30, 2021 | Modified: Nov 03, 2025
CVSS 3.x
7.5
HIGH
Source:
NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.x
5 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P
RedHat/V2
RedHat/V3
6.5 MODERATE
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Ubuntu
MEDIUM
Vulnerability-free packages from our partners
Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2021-4186
CWEhttps://cwe.mitre.org/data/definitions/476.html

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

Weakness

The product dereferences a pointer that it expects to be valid but is NULL.

Affected Software

Name Vendor Start Version End Version
Wireshark Wireshark 3.4.0 (including) 3.4.10 (including)
Wireshark Ubuntu esm-apps/focal *
Wireshark Ubuntu focal *
Wireshark Ubuntu hirsute *
Wireshark Ubuntu impish *
Wireshark Ubuntu kinetic *
Wireshark Ubuntu lunar *
Wireshark Ubuntu mantic *
Wireshark Ubuntu trusty *
Wireshark Ubuntu trusty/esm *
Wireshark Ubuntu upstream *
Wireshark Ubuntu xenial *

Potential Mitigations

References

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