---
id: CVE-2025-9817
title: SSH dissector crash in Wireshark 4.4.0 to 4.4.8 allows denial of service
summary: SSH dissector crash in Wireshark 4.4.0 to 4.4.8 allows denial of service
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'
cwe:
  - CWE-476
vendor: wireshark
product: wireshark
affected:
  - 'wireshark >= 4.4.0, <= 4.4.8'
  - wireshark = 4.4.9
published: '2025-09-03'
updated: '2026-09-26'
sourceUpdated: '2026-09-26T00:10:00.127'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-9817'
references:
  - url: 'https://gitlab.com/wireshark/wireshark/-/issues/20642'
    label: cve@gitlab.com
  - url: 'https://www.wireshark.org/security/wnpa-sec-2025-03.html'
    label: cve@gitlab.com
tags:
  - nvd
epss: 0.00208
epssPercentile: 0.09688
ingestedAt: '2026-09-26T00:22:39.907Z'
---

## Overview

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

## Affected

- `wireshark >= 4.4.0, <= 4.4.8`
- `wireshark = 4.4.9`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.