What is CVE-2018-18227?

CVE-2018-18227 is a high-severity vulnerability in Wireshark, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2018-10-12.

How severe is CVE-2018-18227?

High severity. CVSS v3 base score is 7.5 out of 10.

NULL pointer dereference in Wireshark

CVE-2018-18227

In Wireshark 2.6.0 to 2.6.3 and 2.4.0 to 2.4.9, the MS-WSP protocol dissector could crash. This was addressed in epan/dissectors/packet-mswsp.c by properly handling NULL return values.

Published 2018-10-12 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.032 (87.6th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 88th percentile — 87.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.031 · newest: 0.032 · change: +0.001

Affected products

Wireshark
Debian Linux — versions 9.0

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

References

bugs.wireshark.org/bugzilla/show_bug.cgi (Patch, Issue Tracking, Vendor Advisory)
www.wireshark.org/security/wnpa-sec-2018-47.html (Patch, Vendor Advisory)
www.securitytracker.com/id/1041909 (VDB Entry, Third Party Advisory, vdb-entry)
www.securityfocus.com/bid/105583 (VDB Entry, Third Party Advisory, vdb-entry)
code.wireshark.org/review/gitweb
www.debian.org/security/2018/dsa-4359 (vendor-advisory, Third Party Advisory)
lists.opensuse.org/opensuse-security-announce/2020-03/msg00027.html (vendor-advisory)
www.oracle.com/security-alerts/cpuapr2020.html

Frequently asked questions

What is CVE-2018-18227?: CVE-2018-18227 is a high-severity vulnerability in Wireshark, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2018-10-12.
How severe is CVE-2018-18227?: High severity. CVSS v3 base score is 7.5 out of 10.