CVE-2026-63447

Suricata ftp: crafted FTP traffic can cause quadratic CPU consumption

Published: Sep 18, 2026Updated: Sep 23, 2026 Sources: CVE List NVDCWE-407

7.5HIGH

Description

Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. From 8.0.5 until 8.0.6, the FTP parser in src/app-layer-ftp.c can continue allocating transactions after app-layer.protocols.ftp.max-tx is reached while processing one large chunk of FTP command data. The oversized transaction list is repeatedly processed with quadratic complexity after the too_many_transactions event, allowing crafted FTP traffic to degrade packet processing, reduce monitoring visibility, or cause denial of service. This issue is fixed in version 8.0.6.

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:LAttack Complexity

Low

PR:NPrivileges Required

None

UI:NUser Interaction

None

Scope

S:UScope

Unchanged

Impact

C:NConfidentiality

None

I:NIntegrity

None

A:HAvailability

High

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Weaknesses

CWE-407

Affected Products

OISF

oss-projectaka libhtp, suricata-update, suricata

suricataOn-premNetwork Device

Networking Infrastructure / firewall

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique

Impact

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References

https://github.com/OISF/suricata/security/advisories/GHSA-w394-3g33-3jg9

github.com

https://github.com/OISF/suricata/commit/15bf91c5ccbbbf640cd042e1c96974b262549385

github.com

https://github.com/OISF/suricata/commit/82c41905589305e8389ceb793907ccb74798aee5

github.com

and 2 more references View all →

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