Is CVE-2024-55591 in the CISA KEV catalog?

Yes. CVE-2024-55591 is on the CISA Known Exploited Vulnerabilities list, added 2025-01-14, and has known ransomware campaign use.

What is the CVSS severity of CVE-2024-55591?

CVE-2024-55591 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2024-55591?

CVE-2024-55591 has an EPSS score of 98.26% (100th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2024-55591?

Upgrade fortios to 7.0.17 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2024-55591

CRITICALCISA KEVEPSS 100th pctl

9.8

CVSS v3

NVD

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.

CWE-288

How to fix

Remediation Available

fortiosNVD

Affected:>= 7.0.0, < 7.0.17Fixed in:7.0.17CVE-2024-55591derived from NVD

fortiproxyNVD

Affected:>= 7.0.0, < 7.0.20Fixed in:7.0.20CVE-2024-55591derived from NVD

Affected:>= 7.2.0, < 7.2.13Fixed in:7.2.13CVE-2024-55591derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

98.26%probability of exploitation in 30 days

100thpercentile

Very high risk: more likely to be exploited than 100% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

Fortinet FortiOS and FortiProxy Authentication Bypass Vulnerability

Fortinet FortiOS and FortiProxy contain an authentication bypass vulnerability that may allow an unauthenticated, remote attacker to gain super-admin privileges via crafted requests to Node.js websocket module.

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Remediation due: 2025-01-21

Associated with ransomware campaigns

References

Vendor Advisory1

fortiguard.fortinet.com

Government Resource1

cisa.gov

Related Vulnerabilities

Other CWE-288 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-42793	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2024-1709	Critical	10.0	100%	KEV + Ransom	Fix
CVE-2024-27198	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2025-4427	Medium	5.3	100%	KEV	Fix
CVE-2023-46747	Critical	9.8	97%	KEV + Ransom	-
CVE-2026-23760	Critical	9.8	96%	KEV + Ransom	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-07-08.