CVE-2025-9817

Name: CVE-2025-9817
Creator: NVD / NIST
Published: 2025-09-03T08:15:31.893+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.19%

Last modified Jun 17, 2026

CVE-2025-9817 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. SSH dissector crash in Wireshark 4.4.0 to 4.4.8 allows denial of service. EPSS estimates a 0.19% chance of exploitation in the next 30 days.

Description

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

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

0.19%

9.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-476

Affected Software

Vendor	Product	Versions	Update
Wireshark	Wireshark	>= 4.4.0, <= 4.4.8	—
Wireshark	Wireshark	4.4.9	Rc0

References

https://gitlab.com/wireshark/wireshark/-/issues/20642Issue Tracking
https://www.wireshark.org/security/wnpa-sec-2025-03.htmlThird Party Advisory

Timeline

Published: Sep 3, 2025
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2025-9817?

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

How severe is CVE-2025-9817?

CVE-2025-9817 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.19% probability of exploitation in the next 30 days.

How do I fix CVE-2025-9817?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-9817?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST