[Update] Vulnerability in Fortinet products (January 14, 2025)
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
[Update on January 28, 2025] A proof of concept for exploiting this vulnerability is publicly available. On January 14, 2025, Fortinet released a security advisory regarding the critical vulnerability CVE-2024-55591 affecting FortiOS and FortiProxy. It allows an...
CSIRTS triage
- What
- A proof of concept for exploiting this vulnerability is publicly available.
- Who is affected
- All deployments of FortiOS and FortiProxy are affected.
- Urgency
- Remediation is urgent due to active exploitation and critical severity.
- Action
- Apply the latest security patches from Fortinet.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://www.cert.ssi.gouv.fr/alerte/CERTFR-2025-ALE-002/
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Exploitation confirmedCVE-2024-55591Already exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 100% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2024-55591 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- criticalexploitedAL26-014 – FortiBleed leak of thousands of compromised credentials impacting Fortinet devicescccs
- criticalexploitedCVE-2024-55591: Fortinet FortiOS and FortiProxy Authentication Bypass Vulnerabilitycisa-kev
Recent advisories for Fortinet products
A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.
- criticalexploitedCVE-2026-24858: Fortinet Multiple Products Authentication Bypass Using an Alternate Path or Channel Vulnerabil…cisa-kev · 2026-01-27
- criticalexploitedCVE-2025-59718: Fortinet Multiple Products Improper Verification of Cryptographic Signature Vulnerabilitycisa-kev · 2025-12-16
- criticalexploitedCVE-2025-32756: Fortinet Multiple Products Stack-Based Buffer Overflow Vulnerabilitycisa-kev · 2025-05-14
- unknownexploitedVulnerability in Fortinet products (May 13, 2025)cert-fr-alerte · 2025-05-13
- criticalexploitedCVE-2024-23113: Fortinet Multiple Products Format String Vulnerabilitycisa-kev · 2024-10-09
- criticalexploitedCVE-2022-40684: Fortinet Multiple Products Authentication Bypass Vulnerabilitycisa-kev · 2022-10-11
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