What is CVE-2025-25249?

CVE-2025-25249 is a high-severity vulnerability in Fortinet Fortios, classified under Heap-based Buffer Overflow. CVSS score: 7.4/10. Published 2026-01-13.

How severe is CVE-2025-25249?

High severity. CVSS v3 base score is 7.4 out of 10.

Buffer overflow in Fortinet Fortios

CVE-2025-25249

A heap-based buffer overflow vulnerability in Fortinet FortiOS 7.6.0 through 7.6.3, FortiOS 7.4.0 through 7.4.8, FortiOS 7.2.0 through 7.2.11, FortiOS 7.0.0 through 7.0.17, FortiOS 6.4 all versions, FortiSwitchManager 7.2.0 through 7.2.6…

Vulnerability class: Buffer Overflow

EPSS: 0.000 (3.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:W/RC:C.

Affected products

Fortinet Fortios — versions 7.6.0, 7.4.0, 7.2.4
Fortinet Fortiswitchmanager — versions 7.2.2

Weakness classification (CWE)

CWE-122 — Heap-based Buffer Overflow

References

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

Frequently asked questions

What is CVE-2025-25249?: CVE-2025-25249 is a high-severity vulnerability in Fortinet Fortios, classified under Heap-based Buffer Overflow. CVSS score: 7.4/10. Published 2026-01-13.
How severe is CVE-2025-25249?: High severity. CVSS v3 base score is 7.4 out of 10.