What’s Vulnerable › Vulnerabilities

CVE-2025-9817: NULL Pointer Dereference in Wireshark

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-09-03 · updated 2026-09-26
• Weakness: CWE-476

Description

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

Affected products

• Wireshark Foundation Wireshark: from 4.4.0 through 4.4.8; 4.4.9-rc0

References

• https://gitlab.com/wireshark/wireshark/-/issues/20642
• https://www.wireshark.org/security/wnpa-sec-2025-03.html

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