CVE-2025-55018: Execute unauthorized code or commands in Fortinet FortiOS
An inconsistent interpretation of http requests ('http request smuggling') vulnerability in Fortinet FortiOS 7.6.0, FortiOS 7.4.0 through 7.4.9, FortiOS 7.2 all versions, FortiOS 7.0 all versions, FortiOS 6.4.3 through 6.4.16 may allow an unauthenticated attacker to smuggle an unlogged http request through the firewall policies via a specially crafted header
AI Analysis
Technical Summary
CVE-2025-55018 is an HTTP request smuggling vulnerability affecting multiple FortiOS versions (6.4.3 to 7.6.0). The issue arises from inconsistent parsing of HTTP requests, enabling an unauthenticated attacker to bypass firewall policies by smuggling unlogged HTTP requests via specially crafted headers. This can result in unauthorized code or command execution with integrity impact but no direct confidentiality or availability impact. The vulnerability has a CVSS 3.1 base score of 5.2 (medium severity) and has an official patch available from Fortinet.
Potential Impact
The vulnerability allows an unauthenticated attacker to bypass firewall policies by smuggling HTTP requests, potentially leading to unauthorized code or command execution. The impact is limited to integrity, with no direct confidentiality or availability effects reported. There are no known exploits in the wild at this time.
Mitigation Recommendations
An official fix is available from Fortinet for affected FortiOS versions. Users should apply the vendor-provided patches promptly to remediate this vulnerability. Since this is not a cloud service, remediation depends on customer action to update their FortiOS installations.
CVE-2025-55018: Execute unauthorized code or commands in Fortinet FortiOS
Description
An inconsistent interpretation of http requests ('http request smuggling') vulnerability in Fortinet FortiOS 7.6.0, FortiOS 7.4.0 through 7.4.9, FortiOS 7.2 all versions, FortiOS 7.0 all versions, FortiOS 6.4.3 through 6.4.16 may allow an unauthenticated attacker to smuggle an unlogged http request through the firewall policies via a specially crafted header
CVSS v3.1
Score 5.2medium
Affected software
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2025-55018 is an HTTP request smuggling vulnerability affecting multiple FortiOS versions (6.4.3 to 7.6.0). The issue arises from inconsistent parsing of HTTP requests, enabling an unauthenticated attacker to bypass firewall policies by smuggling unlogged HTTP requests via specially crafted headers. This can result in unauthorized code or command execution with integrity impact but no direct confidentiality or availability impact. The vulnerability has a CVSS 3.1 base score of 5.2 (medium severity) and has an official patch available from Fortinet.
Potential Impact
The vulnerability allows an unauthenticated attacker to bypass firewall policies by smuggling HTTP requests, potentially leading to unauthorized code or command execution. The impact is limited to integrity, with no direct confidentiality or availability effects reported. There are no known exploits in the wild at this time.
Mitigation Recommendations
An official fix is available from Fortinet for affected FortiOS versions. Users should apply the vendor-provided patches promptly to remediate this vulnerability. Since this is not a cloud service, remediation depends on customer action to update their FortiOS installations.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- fortinet
- Date Reserved
- 2025-08-05T06:24:18.650Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
Threat ID: 698c57814b57a58fa18c0335
Added to database: 02/11/2026, 10:18:41 UTC
Last enriched: 05/13/2026, 02:35:20 UTC
Last updated: 09/10/2026, 19:36:51 UTC
Views: 232
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