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No exploitation reportedFix available

CVE-2025-55018

No exploitation reported by the sources we read.

  • Published2026-02-10
  • Fixed in7.4.10
  • WeaknessCWE-444

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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

Timeline

dates in UTC
  1. 2026-02-1016:16CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2025-55018?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2025-55018?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Fortinet FortiOS
BranchAffectedFixed in
7.x≥ 7.0.0, < 7.4.107.4.10
6.4≥ 6.4.3, ≤ 6.4.16no fix published
7.6= 7.6.0no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

  • ICSA-26-071-02 CISA1 known affected

    Siemens RUGGEDCOM APE1808 Devices

    RUGGEDCOM APE1808

  • SSA-975644 Siemens ProductCERT1 known affected

    SSA-975644: Multiple Vulnerabilities in Fortigate NGFW on RUGGEDCOM APE1808 Devices

    RUGGEDCOM APE1808

Full record on NVD

Fix

  1. Update Fortinet FortiOS to 7.4.10
  2. Vendor fix Siemens ProductCERT SSA-975644 · 1 productUpdate Fortigate NGFW to V7.4.10 or later version. Contact customer support to receive patch and update information
  3. Vendor fix CISA ICSA-26-071-02 · 1 productUpdate Fortigate NGFW to V7.4.10 or later version. Contact customer support to receive patch and update information

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

Sources

  • NVDCVE recordread 2026-10-23
  • CISA-ADPSSVC decisionnone2026-02-11
  • OpenCVESSVC decisionnone—
  • CNACVSS 3.15.8read 2026-10-23
  • CNAweakness (CWE)CWE-444read 2026-10-23
  • FIRST EPSSEPSS score0.4 %2026-10-23

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
Published
2026-02-10
Last Modified
2026-06-17
NVD status
Modified

Frequently asked questions

What is CVE-2025-55018?

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

Is CVE-2025-55018 actively exploited?

Active exploitation of CVE-2025-55018 has not been confirmed. Its EPSS score was 0.4% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2025-55018?

CVE-2025-55018 has a CVSS v3 base score of 5.8 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N.

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