Known exploited vulnerability
CVE-2024-55591
The short answer
CVE-2024-55591 affects Fortinet FortiOS and is rated critical (CVSS 9.8). CISA added it to the Known Exploited Vulnerabilities catalog on 2025-01-14: attackers are using it, so patch it first.
What it is
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.
Weakness: CWE-288.
Severity
9.8 critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Exploited (CISA KEV)
Yes, since Jan 14, 2025
Federal due date Jan 21, 2025
EPSS, next 30 days
94%
Higher than 100% of scored CVEs
How it can be exploited
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
What CISA says to do
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Affected products
FortiOS, FortiProxy. NVD's record lists the exact affected versions.
References
- fortiguard.fortinet.com/psirt/FG-IR-24-535 MitigationVendor Advisory
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-55591 US Government Resource
Questions
Is CVE-2024-55591 being exploited?
Yes. CISA added CVE-2024-55591 to its Known Exploited Vulnerabilities catalog on 2025-01-14, with a federal remediation due date of 2025-01-21. CISA lists it as used in ransomware campaigns.
How do I fix CVE-2024-55591?
CISA's required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.
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