KEV Intelligence

Vulnerability report

Exploited in the wild Confirmed confidence In CISA KEV

CVE-2024-55591

FortiOS Authentication Bypass

Fortinet / FortiOS · 7.0.0 to <= 7.0.16

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Severity
CVSS 9.6 · Critical
Confidence
Confirmed
Exploit status
Exploited in the wild
EPSS
98.3%
First observed
—
Last observed
—

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2024-55591 is an unauthenticated vulnerability affecting Fortinet FortiOS, FortiProxy. An Authentication Bypass Using an Alternate Path or Channel vulnerability [CWE-288] affecting FortiOS version 7.0.0 through...

Is it exploited?

Yes. KEV Intelligence tracks this CVE as a known exploited vulnerability. Confidence is confirmed.

Who is affected?

Fortinet / FortiOS 7.0.0 to <= 7.0.16.

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

FortiOS Authentication Bypass

An Authentication Bypass Using an Alternate Path or Channel vulnerability [CWE-288] affecting FortiOS version 7.0.0 through 7.0.16 and FortiProxy version 7.0.0 through 7.0.19 and 7.2.0 through 7.2.12 allows a remote attacker to gain super-admin privileges via crafted requests to Node.js websocket module.

Vendor Product Affected Status
Fortinet FortiOS Through 7.0.16 Affected
Fortinet FortiProxy Through 7.2.12 Affected
Fortinet FortiProxy Through 7.0.19 Affected
Published
14 Jan 2025
Exploitation Reported
14 Jan 2025
Attack vector
Remote
Complexity
Low
Privileges
None
User interaction
None

Tags

edge ransomware nuclei_scanner cisa malware ios nessus_scanner nodejs

CVE References

Exploitation evidence

Why KEV Intelligence marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

CISA

Recorded 14 Jan 2025

Independent exploitation attestation added to the KEV Intelligence record.

Used in malware

CISA

Recorded 14 Jan 2025

Malware families have been linked to exploitation of this CVE.

Proof of concept available

GitHub

Recorded 22 Jan 2025

Public scanner or PoC coverage increases practical exploitability.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the KEV Intelligence Pro API.

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Source Added
CISA First 2025-01-14 00:00 UTC
CVE 2026-07-08 13:20 UTC

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets
0
User-Agents
0

Raw values available in Pro and Enterprise.

Virtual patch status

No KEV Intelligence virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

Scanner Artifacts

Scanner and exploit-framework references linked to this CVE.

Scanner Reference Detected
Nuclei https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2024/CVE-2024-55591.yaml 25 Apr 2025
Nessus https://www.tenable.com/plugins/nessus/214072 14 Jan 2025

Risk and context

Severity, weaknesses, and research context

CVSS v3.1

9.6 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:H/RL:O/RC:C

EPSS

98.3%

Weaknesses

Authentication Bypass Using an Alternate Path or Channel CWE-288

Recent mention · Tenable Blog

CVE-2025-32756: Zero-Day Vulnerability in Multiple Fortinet Products Exploited in the Wild

Fortinet has observed threat actors exploiting CVE-2025-32756, a critical zero-day arbitrary code execution vulnerability which affects multiple Fortinet products including FortiVoice, FortiMail, FortiNDR, FortiRecorder and FortiCamera.BackgroundOn May 13th, Fortinet published...

Read full advisory

Potential Proof of Concepts

These PoCs are unverified and could contain malware. Use at your own risk.

Fortinet - Authentication Bypass

nuclei · Created Unknown

Timeline

From disclosure to observed exploitation

  1. KEV confirmed by CVE

    Exploitation attested by an external source

  2. Public PoC available

    Public proof-of-concept code published

  3. Nuclei template available

    Scanner coverage available

  4. Nessus plugin available

    Scanner coverage available

  5. CVE published

    Vulnerability disclosed publicly

  6. Added to CISA KEV

    Listed in the CISA Known Exploited Vulnerabilities catalog

  7. First public exploitation report

    Exploit observed in malware

  8. CVE ID reserved

    Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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  • Evidence confidence and provenance
  • First-party sensor telemetry
  • PoC and scanner references
  • Affected versions and enrichment
  • Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2024-55591

Free JSON includes basic KEV fields 
{
  "cve_id": "CVE-2024-55591",
  "confidence": "Confirmed",
  "cvss_score": 9.6,
  "cvss_estimated": false,
  "epss_score": 0.98259,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}

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