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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-63450
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-18 21:17:04 UTC
Updated2026-09-18 21:17:04 UTC
DescriptionSuricata 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.

Risk And Classification

Primary CVSS: v3.1 3.7 LOW from [email protected]

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

EPSS: 0.002450000 probability, percentile 0.160590000 (date 2026-09-19)

Problem Types: CWE-755 | CWE-755 CWE-755: Improper Handling of Exceptional Conditions

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary3.7LOWCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
3.1CNADECLARED3.7LOWCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA OISF Suricata affected < 8.0.6 Not specified

References

ReferenceSourceLinkTags
github.com/OISF/suricata/security/advisories/GHSA-56wx-7hqh-wfgr [email protected] github.com
github.com/OISF/suricata/pull/15704 [email protected] github.com
github.com/OISF/suricata/commit/feb0ff91159cea474a983adf92e4b56fb16e4ffc [email protected] github.com
github.com/OISF/suricata/releases/tag/suricata-8.0.6 [email protected] github.com
redmine.openinfosecfoundation.org/issues/8659 [email protected] redmine.openinfosecfoundation.org
github.com/OISF/suricata/commit/52490b8c26909772801afed98df63a6d62f3af18 [email protected] github.com
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