High severity · published Sep 3, 2025
CVE-2025-9817
NULL Pointer Dereference in Wireshark
7.5
CVSS
0.2%
EPSS
No
On KEV
Description
SSH dissector crash in Wireshark 4.4.0 to 4.4.8 allows denial of service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 11% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
WI
Wireshark · Wireshark Foundation
4.4.0 before 4.4.9 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-9817
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-9817
Issue Tracking
https://gitlab.com/wireshark/wireshark/-/issues/20642
Third Party Advisory
https://www.wireshark.org/security/wnpa-sec-2025-03.html
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