# CVE-2022-23439 — Fortinet FortiTester

> As of 2026-01-14, CVE-2022-23439 is a MEDIUM-severity vulnerability in Fortinet FortiTester, CVSS v3.1 4.1, EPSS 0.4% (37.0th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2022-23439, most recently “Multiple Fortinet FortiOS Vulnerabilities (incl. CVE-2024-23113) Affect Siemens RUGGEDCOM APE1808 via Bundled Fortinet NGFW < V7.4.3 (SSA-832273)”.

**Last updated:** 2026-01-14

## What is CVE-2022-23439?

A externally controlled reference to a resource in another sphere vulnerability in Fortinet allows attacker to poison web caches via crafted HTTP requests, where the `Host` header points to an arbitrary webserver

The record classifies CVE-2022-23439 under weakness class [CWE-610](https://cwe.mitre.org/data/definitions/610.html). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs a user to take an action first. 12 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 639 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 4.1 — MEDIUM (`CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C`)
- **EPSS (FIRST):** 0.4% probability of exploitation in the next 30 days, higher than 37.0% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 3.5/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2025-01-22, last modified 2026-01-14

## Is CVE-2022-23439 being exploited?

It currently carries a trending score of 14 in the Threadlinqs vulnerability feed.

## Affected products and versions

- [Fortinet](https://intel.threadlinqs.com/vendors/fortinet): FortiTester, FortiOS, FortiRecorder, FortiNDR, FortiADC, FortiManager, FortiVoice, FortiSOAR on-premise, FortiDDoS, FortiWLC, FortiAnalyzer, FortiPortal

## How to fix CVE-2022-23439

No vendor patch reference has been recorded for CVE-2022-23439 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2022-23439

1 tracked threat in the Threadlinqs corpus references CVE-2022-23439, either in the campaign’s CVE list or as an indicator on the campaign record.

- [Multiple Fortinet FortiOS Vulnerabilities (incl. CVE-2024-23113) Affect Siemens RUGGEDCOM APE1808 via Bundled Fortinet NGFW < V7.4.3 (SSA-832273)](https://intel.threadlinqs.com/threat/TL-2026-2489) — CRITICAL · 2026-09-13

## Sources

Enriched from CVE.org, FIRST EPSS. Last verified by Threadlinqs on 2026-10-10.

**Other references**

- [fortiguard.com](https://fortiguard.com/psirt/FG-IR-23-494)

Canonical: https://intel.threadlinqs.com/cve/CVE-2022-23439
Full detection coverage and IOCs for threats exploiting CVE-2022-23439 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp