Fortinet Multiple Products Heap-based Buffer Overflow Vulnerability

Fortinet Multiple Products

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 (federal deadline 2026-09-12).

First seen: 9 Sept 2026
Last update: 9 Sept 2026, 12:00 UTC
Identifiers: CVE-2025-25249
Source: CISA KEV
On the menu as: VPN & firewalls

Check this repository for exposure to one security incident from pwned.coffee. Report first, change nothing until I say so.

## Fortinet Multiple Products Heap-based Buffer Overflow Vulnerability
Severity: high, exploited in the wild. Patch status: patched.
Affected: Fortinet Multiple Products
Ids: CVE-2025-25249

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 (federal deadline 2026-09-12).

## Steps
1. This touches infrastructure (vpn-edge). Look in terraform, ansible, cloud-init, Dockerfiles and docs for the product and version we run. If it isn't in the repo, say so and list what a human should check on the box.

## Report
A table: file, product or package, version in use, affected yes/no, exact fix. Then anything a human has to check outside the repo.

If you have the pwned.coffee MCP server (https://pwned.coffee/mcp), call lookup_cve("CVE-2025-25249") for the latest, and check_repo with this repo's lockfiles, Dockerfiles and workflows for a full receipt.
Sources: https://fortiguard.fortinet.com/psirt/FG-IR-25-084 https://nvd.nist.gov/vuln/detail/CVE-2025-25249
https://pwned.coffee/i/fortinet-multiple-products-heap-based-buffer-overflow-vu-cve-2025-25249

Sources

Totalone hot coffee