Heap-based Buffer Overflow in Fortinet FortiOS and FortiSASE Products
CVE-2025-25249

7.4HIGH

Key Information:

Vendor

Fortinet
Status
Fortiswitchmanager
FortiOS
Vendor
CVE Published:
13 January 2026

What is CVE-2025-25249?

A heap-based buffer overflow vulnerability in Fortinet's FortiOS and FortiSASE products allows attackers to execute unauthorized code or commands by sending specially crafted packets. This vulnerability affects a range of FortiOS versions, making it critical for users to apply the appropriate updates to mitigate potential exploitation.

Affected Version(s)

FortiOS 7.6.0 <= 7.6.2

FortiOS 7.4.0 <= 7.4.7

FortiOS 7.2.4 <= 7.2.11

References

https://fortiguard.fortinet.com/psirt/FG-IR-25-084

CVSS V3.1

Score:
7.4
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.