CVE-2024-55591
Confirmed PUBLISHEDAn Authentication Bypass Using an Alternate Path or Channel vulnerability [CWE-288] affecting FortiOS version 7.0.0 through 7.0.16 and FortiProxy...
Recommended Action
Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
At a Glance
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.
- CVE Published
- Jan 14, 2025
- Exploitation Reported
- Jan 14, 2025
- CVSS
- 9.6 Critical
- EPSS
- 98.3%
Affected Versions
| Vendor | Product | Version | Status |
|---|---|---|---|
| Fortinet |
FortiOS
|
7.0.0 to <= 7.0.16 |
Affected |
| Fortinet |
FortiProxy
|
7.2.0 to <= 7.2.12 |
Affected |
| Fortinet |
FortiProxy
|
7.0.0 to <= 7.0.19 |
Affected |
CVE References
- https://fortiguard.fortinet.com/psirt/FG-IR-24-535 fortiguard.fortinet.com · CVE Record https://fortiguard.fortinet.com/psirt/FG-IR-24-535
Recommended Actions
- Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
- Check enrichment artifacts for scanner coverage and available PoCs before rolling remediation validation.
- Use the Pro API to automate enrichment, telemetry, and workflow delivery for VM, SOC, and CTI pipelines.
Known Exploited Vulnerability Sources
Catalogues that list this CVE as a known exploited vulnerability.
Per-source evidence links for KEV attestations are available through the KEVIntel Pro API.
Learn about Pro API access| Source | Added |
|---|---|
| CISA First | 2025-01-14 00:00 UTC |
| CVE | 2026-07-08 13:20 UTC |
Scanner Artifacts
Nuclei and Metasploit references linked to this CVE.
| Scanner | Reference | Detected |
|---|---|---|
| Nuclei | https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2024/CVE-2024-55591.yaml | Apr 25, 2025 |
Virtual Patch
Compensating WAF rules to help reduce exposure to this CVE. Rule content and deployable vendor exports are available with KEVIntel Enterprise.
KEVIntel does not currently have a virtual patch for this CVE. When available, KEVIntel virtual patches ship as deployable ModSecurity, Cloudflare, and AWS WAF rules.
Enterprise feature. Virtual patch rule content and deployable vendor exports (ModSecurity, Cloudflare, AWS WAF) are available to KEVIntel Enterprise users.
CVSS Scores
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
Exploitation Status
Exploited in the wild
Recorded 2025-01-14 00:00:00 UTC · CISA
Used in malware
Recorded 2025-01-14 00:00:00 UTC · CISA
Proof of concept available
Recorded 2025-01-22 14:16:30 UTC · GitHub
Weaknesses (CWE)
-
Authentication Bypass Using an Alternate Path or Channel
Scanner Integrations
| Scanner | Reference | Detected |
|---|---|---|
| Nuclei | https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2024/CVE-2024-55591.yaml | Apr 25, 2025 |
| Nessus | https://www.tenable.com/plugins/nessus/214072 | Jan 14, 2025 |
Recent Mentions
Tenable Blog · May 14, 2025
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 a security advisory (FG-IR-25-254) for CVE-2025-32756, a critical arbitrary code execution vulnerability affecting multiple Fortinet products.CVEDescriptionCVSSv3CVE-2025-32756An arbitrary code execution vulnerability in FortiVoice, FortiMail, FortiNDR, FortiRecorder and FortiCamera9.6AnalysisCVE-2025-32756 is an arbitrary code execution vulnerability affecting multiple Fortinet products including FortiVoice, FortiMail, FortiNDR, FortiRecorder and FortiCamera. A remote unauthenticated attacker can send crafted HTTP requests in order to create a stack-based overflow condition which would allow for the execution of arbitrary code. This vulnerability was discovered by the Fortinet Product Security Team who observed threat activity involving a device running FortiVoice.According to Fortinet, the threat actors operations included scanning the network, erasing system crashlogs and enabling ‘fcgi debugging’ which is used to log authentication attempts, including SSH logins. The ‘fcgi debugging’ option is not enabled by default and the Fortinet advisory recommends reviewing the setting as one possible indicator of compromise (IoC).Historical Exploitation of Fortinet DevicesFortinet vulnerabilities have historically been common targets for cyber attackers, and CVE-2025-32756 is the eighteenth Fortinet vulnerability to be added to the Cybersecurity and Infrastructure Security Agency’s (CISA) Known Exploited Vulnerabilities (KEV) list.CVEDescriptionPatchedTenable BlogCVE-2024-55591Fortinet Authentication Bypass in FortiOS and FortiProxyJanuary 2025CVE-2024-55591: Fortinet Authentication Bypass Zero-Day Vulnerability Exploited in the WildCVE-2024-21762Fortinet FortiOS Out-of-bound Write Vulnerability...
Potential Proof of Concepts
These PoCs are unverified and could contain malware. Use at your own risk.
github · Created 2025-01-29 14:54:40 UTC · 10 stars
A comprehensive all-in-one Python-based Proof of Concept script to discover and exploit a critical authentication bypass vulnerability (CVE-2024-55591) in certain Fortinet devices.
github · Created 2025-01-27 06:25:53 UTC · 52 stars
github · Created 2025-01-24 20:29:56 UTC · 5 stars
An Authentication Bypass Using an Alternate Path or Channel vulnerability [CWE-288] affecting FortiOS and FortiProxy may allow a remote attacker to gain super-admin privileges via crafted requests to Node.js websocket module.
github · Created 2025-01-22 14:16:30 UTC · 3 stars
github · Created 2025-01-21 12:30:21 UTC · 23 stars
github · Created 2025-01-16 07:26:15 UTC · 65 stars
nuclei · Created Unknown
Timeline
Key exploitation, disclosure, scanner coverage, and KEV attestation events for this CVE.
-
13:20 UTC 13 days ago13:20 UTC · 13 days ago
KEV confirmed by CVE
Exploitation attested by an external source
-
00:00 UTC about 1 year ago00:00 UTC · about 1 year ago
Nuclei template available
Scanner coverage available
-
07:26 UTC over 1 year ago07:26 UTC · over 1 year ago
Public PoC available
Public proof-of-concept code published
-
18:27 UTC over 1 year ago18:27 UTC · over 1 year ago
Nessus plugin available
Scanner coverage available
-
14:08 UTC over 1 year ago14:08 UTC · over 1 year ago
CVE published
Vulnerability disclosed publicly
-
00:00 UTC over 1 year ago00:00 UTC · over 1 year ago
Added to CISA KEV
Listed in the CISA Known Exploited Vulnerabilities catalog
-
00:00 UTC over 1 year ago00:00 UTC · over 1 year ago
First public exploitation report
Exploit observed in malware
-
11:19 UTC over 1 year ago11:19 UTC · over 1 year ago
CVE ID reserved
Identifier reserved by the CNA
Automate This Intelligence with the Pro API
Confidence scoring, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
Pro API Example
GET /api/v2/pro/kevs/CVE-2024-55591
{
"cve_id": "CVE-2024-55591",
"title": "An Authentication Bypass Using an Alternate Path or Channel vulnerability [CW...",
"affected_vendor": "Fortinet",
"affected_product": "FortiOS, FortiProxy",
"affected_versions": [
{ "vendor": "...", "product": "...", "status": "affected", "display_label": "..." }
],
"confidence": "Confirmed",
"cvss_score": 9.6,
"epss_score": 0.98259,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": false
},
"sensor_telemetry": { "...": "Pro API fields" },
"proof_of_concepts": [ "..." ],
"scanner_integrations": [ "..." ]
}