highclosedpatched

Fortinet Multiple Products: Fortinet Multiple Products Heap-based Buffer Overflow Vulnerability

› Fortinet Multiple Products

last updated Sep 9, 2026

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started: Sep 9, 2026
closed: Sep 9, 2026
CVEs: 1
sources: 3

## summary

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. Added to CISA KEV on 2026-09-09.

severity: Actively exploited (CISA KEV)

## cve ids[1]

CVE-2025-25249

## affected

See vendor advisory / CISA notes (versions not always listed in KEV feed)

## fixed in

See vendor advisory linked in sources

## timeline[1]

Sep 9, 2026
CISA added CVE-2025-25249 to the KEV catalog (due 2026-09-12).

## advisories[3]

## notes & caveats

Derived from CISA KEV JSON feed catalogVersion 2026.10.21. Exact affected/fixed version strings are not always in the KEV record — verify against the vendor advisory URL. startedAt uses dateAdded (exploitation may have begun earlier).

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