Medium severity · published Sep 18, 2026
CVE-2026-63450
Suricata ftp: RETR/STOR before PORT/PASV can disable further IDS app-layer detection
5.3
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 16% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SU
suricata · OISF
< 8.0.6 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-63450
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-63450
Patch
https://github.com/OISF/suricata/commit/52490b8c26909772801afed98df63a6d62f3af18
Patch
https://github.com/OISF/suricata/commit/feb0ff91159cea474a983adf92e4b56fb16e4ffc
Patch
https://github.com/OISF/suricata/pull/15704
Release Notes
https://github.com/OISF/suricata/releases/tag/suricata-8.0.6
Vendor Advisory
https://github.com/OISF/suricata/security/advisories/GHSA-56wx-7hqh-wfgr
Permissions Required
https://redmine.openinfosecfoundation.org/issues/8659
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