CVE-2025-25249: Fortinet Multiple Products Heap-based Buffer Overflow Vulnerability
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 FortiOS, FortiSwitchManager, and FortiSASE contain a heap-based buffer overflow vulnerability that allows an attacker to execute unauthorized code or commands via specially crafted packets.
Details
Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2025-25249
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-2025-25249Already exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 53% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2025-25249 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- highexploited[UPDATE] [hoch] Fortinet FortiOS: Schwachstelle ermöglicht Codeausführungcert-bund
- criticalexploitedFortinet security advisory (AV26-023) - Update 1cccs
- highexploitedCISA Adds Four Known Exploited Vulnerabilities to Catalogcisa
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