What is CVE-2018-9258?

CVE-2018-9258 is a high-severity vulnerability in Wireshark, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2018-04-04.

How severe is CVE-2018-9258?

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

Improper input validation in Wireshark

CVE-2018-9258

In Wireshark 2.4.0 to 2.4.5, the TCP dissector could crash. This was addressed in epan/dissectors/packet-tcp.c by preserving valid data sources.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2018-04-04 · 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: 0.019 (79.0th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 79th percentile — 79.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.019 · newest: 0.019 · change: -0.000

Affected products

Wireshark
Debian Linux — versions 7.0

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

code.wireshark.org/review/gitweb
lists.debian.org/debian-lts-announce/2018/05/msg00019.html (mailing-list, Mailing List, Third Party Advisory)
www.wireshark.org/security/wnpa-sec-2018-21.html (Vendor Advisory)
bugs.wireshark.org/bugzilla/show_bug.cgi (Exploit, Issue Tracking, Vendor Advisory)

Frequently asked questions

What is CVE-2018-9258?: CVE-2018-9258 is a high-severity vulnerability in Wireshark, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2018-04-04.
How severe is CVE-2018-9258?: High severity. CVSS v3 base score is 7.5 out of 10.