PT-2026-7273 · Fortinet · Fortios

Published 2026-02-10 · Updated 2026-02-23 · CVE-2025-55018

Positive Technologies (AI Summary)

CVSS v3.1

5.8

Medium

Base vector

AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N

Name of the Vulnerable Software and Affected Versions Fortinet FortiOS versions 6.4.3 through 6.4.16 Fortinet FortiOS versions 7.0 all versions Fortinet FortiOS versions 7.2 all versions Fortinet FortiOS versions 7.4.0 through 7.4.9 Fortinet FortiOS version 7.6.0

Description An issue exists in the handling of HTTP requests, specifically an inconsistent interpretation that can lead to 'http request smuggling'. This allows an unauthenticated attacker to send an unlogged HTTP request through firewall policies using a specially crafted header.

Recommendations Fortinet FortiOS versions 6.4.3 through 6.4.16 should be updated. Fortinet FortiOS versions 7.0 all versions should be updated. Fortinet FortiOS versions 7.2 all versions should be updated. Fortinet FortiOS versions 7.4.0 through 7.4.9 should be updated. Fortinet FortiOS version 7.6.0 should be updated.

Fix

HTTP Request/Response Smuggling

Weakness Enumeration

CWE-444

Related Identifiers

BDU:2026-01819

CVE-2025-55018

Affected Products

Fortios

References · 7

• https://bdu.fstec.ru/vul/2026-01819 · Security Note
• https://fortiguard.fortinet.com/psirt/FG-IR-25-667 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-55018 · Security Note
• https://osv.dev/vulnerability/CVE-2025-55018 · Vendor Advisory
• https://cert-portal.siemens.com/productcert/html/ssa-975644.html · Note
• https://t.me/cveNotify/152859 · Telegram Post
• https://twitter.com/autumn_good_35/status/2022271120682938747 · Twitter Post