NULL pointer dereference in Wireshark
CVE-2025-9817
SSH dissector crash in Wireshark 4.4.0 to 4.4.8 allows denial of service
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.002 (9.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 10th percentile — 9.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000
Affected products
- Wireshark — versions 4.4.9
- Wireshark Foundation — versions 4.4.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.wireshark.org/security/wnpa-sec-2025-03.html (Third Party Advisory)
- gitlab.com/wireshark/wireshark/-/issues/20642 (issue-tracking, permissions-required, Issue Tracking)
Frequently asked questions
- What is CVE-2025-9817?
- CVE-2025-9817 is a high-severity vulnerability in Wireshark, classified under NULL Pointer Dereference. CVSS score: 7.8/10. Published 2025-09-03.
- How severe is CVE-2025-9817?
- High severity. CVSS v3 base score is 7.8 out of 10.
- Is CVE-2025-9817 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.