CVE-2025-25249
Heap-based Buffer Overflow in Fortinet Multiple Products. CISA confirmed attackers exploit it and added it to its Known Exploited Vulnerabilities catalog on 9 September 2026.
- Product
- Fortinet Multiple Products
- Added to CISA's catalog
- Federal fix-by date
- Ransomware
- No known use in ransomware campaigns
- Vendor advisories
- Sources
- CISA’s catalog, NVD entry
CISA’s description.
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.
More from Fortinet this year.
- CVE-2025-61624 Path Traversal, added
- CVE-2026-104286 Path Traversal, added
- CVE-2025-68686 Exposure of Sensitive Information to an Unauthorized Actor, added
- CVE-2026-39808 OS Command Injection, added
- CVE-2026-25089 OS Command Injection, added
- CVE-2026-21643 SQL Injection, added
- CVE-2026-35616 Improper Access Control, added
- CVE-2026-24858 Authentication Bypass Using an Alternate Path or Channel, added
Every flaw CISA confirmed exploited in the last 30 days is on the exploit watch. This is not security advice. Check the vendor’s advisory before acting. From CISA’s catalog of 4 November 2026.