---
id: "CVE-2026-106174"
kind: "vulnerability"
aliases: ["CVE-2026-106174"]
title: "FortiOS: improper locking lets crafted HTTP requests knock out management HTTPS"
severity: "high"
cvss: 7.5
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["firewall", "fortinet", "fortios", "infrastructure", "self-hosted"]
not_affected_if: ["auth-required"]
published_at: "2026-10-27T07:16:32+00:00"
first_seen_at: "2026-10-27T07:30:44+00:00"
updated_at: "2026-10-27T07:31:57+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-106174", "first_seen_at": "2026-10-27T07:30:44+00:00"}]
---

# FortiOS: improper locking lets crafted HTTP requests knock out management HTTPS

A locking flaw in FortiOS 8.0.0 and 7.6.4 through 7.6.6 lets an unauthenticated attacker on the network send crafted HTTP requests that hang the HTTPS management interface. The result is a denial of service against the device's admin interface, with no code execution or data access described in the sources.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the running FortiOS version in the admin GUI or with `get system status` over CLI
- Check whether HTTPS administrative access is exposed on any interface reachable from untrusted networks, with `show system global` and `show system interface`

## Fix

- Move FortiOS to a fixed release after `7.6.6`, as published in the Fortinet advisory (fixed version unknown from the sources)
- Restrict HTTPS administrative access to trusted management networks until patched

## Timeline

- 2026-10-27T07:30:44+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-106174

## From the sources

A improper locking vulnerability in Fortinet FortiOS 8.0.0, FortiOS 7.6.4 through 7.6.6 may allow an unauthenticated attacker with network access to the device to cause a denial of service of the HTTPS management interface via crafted HTTP requests.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_