CVE-2026-63450: CWE-755: Improper Handling of Exceptional Conditions in OISF suricata
CVE-2026-63450 is a vulnerability in Suricata prior to version 8.0.6 where the FTP parser improperly handles certain FTP commands. Specifically, sending a RETR or STOR command before PORT or PASV negotiation causes a fatal application-layer error that disables FTP parsing for the remainder of the TCP flow. This can allow later FTP commands to bypass parser-dependent rules and logging, potentially evading detection. The issue is fixed in Suricata version 8.0.6.
AI Analysis
Technical Summary
Suricata versions before 8.0.6 contain a flaw in the FTP application-layer parser (src/app-layer-ftp.c) where a RETR or STOR command sent prior to PORT or PASV negotiation triggers a fatal error. This fatal state disables FTP parsing for the rest of the TCP connection, allowing subsequent FTP commands to evade detection by parser-dependent rules and logging mechanisms. In IPS mode, the flow is dropped instead. The vulnerability is classified as CWE-755 (Improper Handling of Exceptional Conditions) and has a CVSS 3.1 base score of 3.7 (low severity). The issue is resolved in version 8.0.6.
Potential Impact
The vulnerability causes the FTP parser to stop processing FTP commands after a specific sequence of commands, which disables application-layer parsing for the remainder of the TCP flow. This can lead to evasion of parser-dependent detection rules and logging, reducing the effectiveness of Suricata's monitoring and intrusion detection capabilities. In IPS mode, the affected flow is dropped, which may impact network traffic. There is no impact on confidentiality or availability beyond the described behavior. No known exploits are reported in the wild.
Mitigation Recommendations
Upgrade Suricata to version 8.0.6 or later, where this issue is fixed. No other mitigation is required as the fix is official and addresses the improper handling of exceptional FTP commands.
CVE-2026-63450: CWE-755: Improper Handling of Exceptional Conditions in OISF suricata
Description
CVE-2026-63450 is a vulnerability in Suricata prior to version 8.0.6 where the FTP parser improperly handles certain FTP commands. Specifically, sending a RETR or STOR command before PORT or PASV negotiation causes a fatal application-layer error that disables FTP parsing for the remainder of the TCP flow. This can allow later FTP commands to bypass parser-dependent rules and logging, potentially evading detection. The issue is fixed in Suricata version 8.0.6.
CVSS v3.1
Score 3.7low
Affected software
OISF
suricata
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Suricata versions before 8.0.6 contain a flaw in the FTP application-layer parser (src/app-layer-ftp.c) where a RETR or STOR command sent prior to PORT or PASV negotiation triggers a fatal error. This fatal state disables FTP parsing for the rest of the TCP connection, allowing subsequent FTP commands to evade detection by parser-dependent rules and logging mechanisms. In IPS mode, the flow is dropped instead. The vulnerability is classified as CWE-755 (Improper Handling of Exceptional Conditions) and has a CVSS 3.1 base score of 3.7 (low severity). The issue is resolved in version 8.0.6.
Potential Impact
The vulnerability causes the FTP parser to stop processing FTP commands after a specific sequence of commands, which disables application-layer parsing for the remainder of the TCP flow. This can lead to evasion of parser-dependent detection rules and logging, reducing the effectiveness of Suricata's monitoring and intrusion detection capabilities. In IPS mode, the affected flow is dropped, which may impact network traffic. There is no impact on confidentiality or availability beyond the described behavior. No known exploits are reported in the wild.
Mitigation Recommendations
Upgrade Suricata to version 8.0.6 or later, where this issue is fixed. No other mitigation is required as the fix is official and addresses the improper handling of exceptional FTP commands.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-07-16T19:35:57.768Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6aad9fc955bf5e2cf583e40c
Added to database: 09/18/2026, 20:32:09 UTC
Last enriched: 09/18/2026, 20:47:06 UTC
Last updated: 09/18/2026, 21:26:56 UTC
Views: 4
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