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CVE-2025-55018VulnerabilityPublished Updated

CVE-2025-55018: Fortinet FortiOS · Execute unauthorized code or commands

Affects Fortinet FortiOSSource CVE Database V5

0

Not known to be exploited · CVSS 5.2 Medium · patch available : update Fortinet FortiOS when convenient.

Data as of 26 Oct 2026, 06:26 UTC

CVSS 3.1 base score
5.2Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.4% chance of exploitation in 30 days – higher than 34% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N/E:P/RL:O/RC:C

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 10 Feb 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2026-10-26.

What to do

Affected software

ProductAffectedFixed in
FortinetFortiOSAffected
  • >=7.4.0 <=7.4.9
  • >=7.2.0 <=7.2.13
  • >=7.0.0 <=7.0.19
  • >=6.4.3 <=6.4.16
  • =7.6.0
Fixed in–

AI-suggested

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.

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

References

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