What’s Vulnerable › Vulnerabilities

CVE-2026-63450: Suricata ftp: RETR/STOR before PORT/PASV can disable further IDS app-layer detection

• Severity: medium (CVSS 5.3 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: 2026-09-18 · updated 2026-09-28
• Weakness: CWE-755

Description

Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. Prior to 8.0.6, the FTP parser in src/app-layer-ftp.c treats a RETR or STOR command sent before PORT or PASV negotiation as a fatal application-layer error instead of a recoverable protocol event. The fatal state disables FTP application-layer parsing for the remainder of the TCP flow, so later commands can evade parser-dependent rules and logging; IPS mode instead drops the flow. This issue is fixed in version 8.0.6.

Affected products

• OISF suricata: before 8.0.6 — fixed in 8.0.6

How to fix

Upgrade to a fixed version: OISF suricata 8.0.6. Check the vendor advisory for mitigations.

References

• https://github.com/OISF/suricata/commit/52490b8c26909772801afed98df63a6d62f3af18
• https://github.com/OISF/suricata/commit/feb0ff91159cea474a983adf92e4b56fb16e4ffc
• https://github.com/OISF/suricata/pull/15704
• https://github.com/OISF/suricata/releases/tag/suricata-8.0.6
• https://github.com/OISF/suricata/security/advisories/GHSA-56wx-7hqh-wfgr
• https://redmine.openinfosecfoundation.org/issues/8659

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