CVE-2024-55591
CriticalExploitedPublic exploitAn 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…
Published Jan 14, 2025 · Updated Aug 5, 2026
Key Facts
Patch immediately- CVE-2024-55591 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting FortiProxy (Fortinet), Fortios (Fortinet).
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jan 14, 2025 and is known to be used in ransomware campaigns. Public exploit code is available.
- EPSS estimates a 94% probability of exploitation in the next 30 days.
- Fixed versions are available, including Fortios 7.0.17, FortiProxy 7.0.20, FortiProxy 7.2.13.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
94%
Higher than 99.8% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings, used by ransomware
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2024-55591 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Jan 14, 2025 | Jan 21, 2025 | Known |
| Industry KEV feed | Jan 14, 2025 | Jan 21, 2025 | Known |
| CIRCL KEV | Jan 14, 2025 | Jan 21, 2025 | Known |
| ENISA EUVD | Jan 14, 2025 | n/a | Not reported |
Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Affected Products
53 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| FortiProxyFortinet | 7.0.0, 7.0.1, 7.0.10, 7.0.11, 7.0.12, 7.0.13, 7.0.14, 7.0.15 | 7.0.20 |
| FortiosFortinet | 7.0.0, 7.0.1, 7.0.10, 7.0.11, 7.0.12, 7.0.13, 7.0.14, 7.0.15 | 7.0.17 |
Patched Releases
Fortios
7.0.17
FortiProxy
7.0.20, 7.2.13
Timeline
Publicly disclosed
Jan 14, 2025
Added to CISA KEV
Jan 14, 2025
Added to Industry KEV feed
Jan 14, 2025
Added to CIRCL KEV
Jan 14, 2025
Added to ENISA EUVD
Jan 14, 2025
Last updated
Aug 5, 2026
Weakness Type
- CWE-288 Authentication Bypass Using an Alternate Path or Channel
References
- advisoryhttps://fortiguard.fortinet.com/psirt/FG-IR-24-535
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
FAQ
Common Questions.
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.
Affected: FortiProxy (Fortinet) versions 7.0.0, 7.0.1, 7.0.10, 7.0.11, 7.0.12, 7.0.13, 7.0.14, 7.0.15; Fortios (Fortinet) versions 7.0.0, 7.0.1, 7.0.10, 7.0.11, 7.0.12, 7.0.13, 7.0.14, 7.0.15. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jan 14, 2025 and is known to be used in ransomware campaigns.
Yes. It was added on Jan 14, 2025 with a federal remediation due date of Jan 21, 2025.
Public exploit code is available.
Fixed versions are available, including Fortios 7.0.17, FortiProxy 7.0.20, FortiProxy 7.2.13.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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