VDB-322308 · CVE-2025-9817 · EUVD-2025-26492

Wireshark up to 4.4.8 SSH Dissector null pointer dereference

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6.5	$0-$5k	0.00

Summaryinfo

A vulnerability classified as problematic was found in Wireshark up to 4.4.8. This affects an unknown function of the component SSH Dissector. The manipulation results in null pointer dereference. This vulnerability was named CVE-2025-9817. The attack may be performed from remote. There is no available exploit. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as problematic has been found in Wireshark up to 4.4.8. Affected is an unknown function of the component SSH Dissector. The manipulation with an unknown input leads to a null pointer dereference vulnerability. CWE is classifying the issue as CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. This is going to have an impact on availability. CVE summarizes:

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

The advisory is shared for download at wireshark.org. This vulnerability is traded as CVE-2025-9817 since 09/02/2025. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 261528 (Linux Distros Unpatched Vulnerability : CVE-2025-9817), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 4.4.9 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (261528), EUVD (EUVD-2025-26492) and CERT Bund (WID-SEC-2025-1932). Once again VulDB remains the best source for vulnerability data.

Affected

Debian Linux
Red Hat Enterprise Linux
SUSE Linux
Oracle Linux
SUSE openSUSE
RESF Rocky Linux
Open Source Wireshark

Productinfo

Type

Packet Analyzer Software

Name

Wireshark

Version

License

open-source

Website

Product: https://www.wireshark.org/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.5
VulDB Meta Temp Score: 6.5

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔒

CNA Base Score: 7.8
CNA Vector (GitLab): 🔒

CVSSv2info

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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 261528
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2025-9817

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Wireshark 4.4.9

Timelineinfo

09/02/2025 CVE reserved
09/03/2025 +1 days Advisory disclosed
09/03/2025 +0 days VulDB entry created
02/10/2026 +160 days VulDB entry last update

Sourcesinfo

Product: wireshark.org

Advisory: wireshark.org
Status: Confirmed

CVE: CVE-2025-9817 (🔒)
GCVE (CVE): GCVE-0-2025-9817
GCVE (VulDB): GCVE-100-322308
EUVD: 🔒
CERT Bund: WID-SEC-2025-1932 - Wireshark: Schwachstelle ermöglicht Denial of Service

Entryinfo

Created: 09/03/2025 10:13
Updated: 02/10/2026 08:56
Changes: 09/03/2025 10:13 (64), 09/03/2025 15:39 (1), 09/06/2025 12:00 (2), 10/10/2025 06:02 (11), 02/10/2026 08:56 (7)
Complete: 🔍
Cache ID: 216::103