CVE-2026-63450Network attack vectorHinoki check available

FTP inspection evasion via fatal parser state

Published Sep 18, 2026 · Updated Sep 18, 2026

Improper exceptional-condition handling in Suricata before 8.0.6 allows remote attackers to evade FTP inspection with crafted commands. The FTP parser in src/app-layer-ftp.c treats RETR or STOR before PORT or PASV negotiation as fatal and stops parsing the remaining TCP flow. Remote attackers must send the sequence through monitored traffic; IDS rules and logs can miss later FTP commands, while IPS mode drops the flow.

CVSS severity3.7
Low
EPSS probability0.25%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
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Summary

What happened

Improper exceptional-condition handling in Suricata before 8.0.6 allows remote attackers to evade FTP inspection with crafted commands. The FTP parser in src/app-layer-ftp.c treats RETR or STOR before PORT or PASV negotiation as fatal and stops parsing the remaining TCP flow. Remote attackers must send the sequence through monitored traffic; IDS rules and logs can miss later FTP commands, while IPS mode drops the flow.

The record

CVE
CVE-2026-63450
Published
Sep 18, 2026
Updated
Sep 18, 2026
Vendor
Open Information Security Foundation
Product
Suricata
Classifications
CWE-755, T1687
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 8.0.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Open Information Security Foundation · Suricataversion=< 8.0.6

Published CVSS scores

3.7GitHubCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-755Improper Handling of Exceptional Conditions
T1687Exploitation for Defense Impairment

Public exploit references

No public exploit references are available in this record.

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Technologies

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