Risk Letters

Exploited vulnerability

CVE-2025-25249

TLP:CLEAR

Fortinet Multiple Products Heap-based Buffer Overflow Vulnerability

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.

Facts

  • Vendor: Fortinet
  • Product: Multiple Products
  • CVSS: 7.4
  • EPSS (probability of exploitation within 30 days): 3.7 %
  • On CISA's Known Exploited Vulnerabilities list since: 9 September 2026
  • First known exploitation: 9 September 2026
  • CISA's deadline for US federal agencies: 12 September 2026
  • Weakness: CWE-122
  • First seen by Risk Letters: 9 September 2026

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Data: NVD (public domain), CISA KEV, FIRST EPSS, MITRE ATT&CK, AlienVault OTX. NVD