Post-exploitation activities in Fortinet FortiGate (April 11, 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.
Fortinet published a blog post on April 10, 2025, indicating the use of a post-exploitation technique that allows for a breach of data confidentiality across the entire system of affected Fortigate devices. This technique relies on the use of a link...
CSIRTS triage
- What
- A post-exploitation technique allows for a breach of data confidentiality.
- Who is affected
- Users of affected FortiGate devices.
- Urgency
- Remediation is urgent as exploitation is confirmed.
- Action
- Follow Fortinet's guidance to secure affected devices.
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-004/
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-2022-42475Already exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 99.9% of all EPSS-scored CVEs.
- Exploitation confirmedCVE-2023-27997Already exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 99.7% of all EPSS-scored CVEs.
- Exploitation confirmedCVE-2024-21762Already exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 99.7% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2022-42475 | coverage & exploitation status | NVD · CVE.org |
| CVE-2023-27997 | coverage & exploitation status | NVD · CVE.org |
| CVE-2024-21762 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- unknownexploitedA method to assess 'forgivable' vs 'unforgivable' vulnerabilitiesncsc-uk
- criticalexploitedCVE-2024-21762: Fortinet FortiOS Out-of-Bound Write Vulnerabilitycisa-kev
- unknownexploited[Update] Vulnerability in Fortinet FortiOS (February 9, 2024)cert-fr-alerte
- criticalexploitedCVE-2023-27997: Fortinet FortiOS and FortiProxy SSL-VPN Heap-Based Buffer Overflow Vulnerabilitycisa-kev
- criticalexploitedCVE-2022-42475: Fortinet FortiOS Heap-Based Buffer Overflow Vulnerabilitycisa-kev
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