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Fencer Vulns
high 7.8

CVE-2025-9817 json

NULL Pointer Dereference in Wireshark

published 2025-09-03 14 mo ago modified 2026-09-26 44 d ago also EUVD-2025-26492

cvss
7.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 10%
public exploits
0
none known

Summary

SSH dissector crash in Wireshark 4.4.0 to 4.4.8 allows denial of service

Patch / fix

  • Wireshark Foundation Wireshark 4.4.9
  • wireshark Debian 12 4.0.17-0+deb12u2
  • wireshark Debian 13 4.4.13-0+deb13u1
  • wireshark Debian 14 4.4.9-1

debian advisories DEBIAN-CVE-2025-9817

  • wireshark RHEL 10.1 1:4.4.2-4.el10_1.2
  • wireshark-cli RHEL 10.1 1:4.4.2-4.el10_1.2
  • wireshark enterprise linux eus 10.0 1:4.4.2-3.el10_0.2
  • wireshark-cli enterprise linux eus 10.0 1:4.4.2-3.el10_0.2

red hat advisories RHSA-2026:2763RHSA-2026:1714

  • wireshark SLE Module for Desktop Applications 15 SP7, SLE Module for Basesystem 15 SP7 4.6.4-150700.21.8.1
  • libvirt SLE Module for Server Applications 15 SP7, SLE Module for Basesystem 15 SP7 11.0.0-150700.4.19.1
  • wireshark SLES for SAP applications 16.0, SLES 16.0 4.4.13-160000.1.1
  • wireshark SLE Module for Desktop Applications 15 SP7, SLE Module for Desktop Applications 15 SP6, SLE Module for Basesystem 15 SP7 +2 more 4.2.13-150600.18.26.1

suse advisories SUSE-SU-2026:1169-1SUSE-SU-2026:20222-1SUSE-SU-2025:03294-1

  • wireshark openSUSE Leap 16.0 4.4.13-160000.1.1
  • wireshark openSUSE Tumbleweed 4.4.9-2.1

opensuse advisories openSUSE-SU-2026:20151-1openSUSE-SU-2025:15522-1

  • wireshark AlmaLinux 10 1:4.4.2-4.el10_1.2
  • wireshark-cli AlmaLinux 10 1:4.4.2-4.el10_1.2

almalinux advisories ALSA-2026:1714

  • wireshark Rocky Linux 10 1:4.4.2-4.el10_1.2

rocky linux advisories RLSA-2026:1714

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-9817 updated cvss 5.5

Wireshark: NULL Pointer Dereference in Wireshark

  • Red Hat Enterprise Linux 6 wireshark, wireshark-gnome
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux AppStream (v. 10) wireshark 4.4.2-4.el10_1.2, wireshark-cli 4.4.2-4.el10_1.2
    fixed: vendor fix RHSA-2026:1714
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) wireshark 4.4.2-3.el10_0.2, wireshark-cli 4.4.2-3.el10_0.2
    fixed: vendor fix RHSA-2026:2763
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) wireshark-devel 4.4.2-4.el10_1.2, wireshark-debuginfo 4.4.2-4.el10_1.2, wireshark-debugsource 4.4.2-4.el10_1.2, wireshark-cli-debuginfo 4.4.2-4.el10_1.2
    fixed: vendor fix RHSA-2026:1714
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) wireshark-devel 4.4.2-3.el10_0.2, wireshark-debuginfo 4.4.2-3.el10_0.2, wireshark-debugsource 4.4.2-3.el10_0.2, wireshark-cli-debuginfo 4.4.2-3.el10_0.2
    fixed: vendor fix RHSA-2026:2763
  • Red Hat Enterprise Linux 7 wireshark, wireshark-gnome Red Hat Enterprise Linux 8 wireshark, wireshark-cli Red Hat Enterprise Linux 9 wireshark, wireshark-cli
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
14 mo ago

Exploit prediction

0.21% chance of exploitation in the next 30 days, higher than 10% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Wireshark Foundation Wireshark

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.