CVE-2025-32756: Fortinet Multiple Products Stack-Based Buffer Overflow Vulnerability

How to check if you are exposed to CVE-2025-32756

1. Find every Fortinet Multiple Products system you or your clients run, including ones exposed to the internet. Those come first: CISA only lists flaws attackers are already using.
2. Compare each version with the fixed versions in the vendor advisory below. Where no fix exists yet, apply the vendor’s mitigation or take the system off the internet.
3. Run a credentialed vulnerability scan to catch the systems you missed, then check that the next scan no longer reports CVE-2025-32756.

US federal agencies had to fix this by 2025-06-04. Everyone else should treat that deadline as a guide: if it has passed, this is overdue.

Timeline

1. 2025-05-14 · Added to CISA's Known Exploited Vulnerabilities catalog
2. 2025-06-04 · Fix-by date for US federal agencies, passed 515 days ago

Vendor advisories and fixes

• https://fortiguard.fortinet.com/psirt/FG-IR-25-254

Weakness type

• CWE-124

More exploited Fortinet vulnerabilities

CISA lists 32 exploited Fortinet vulnerabilities. The closest matches:

• CVE-2025-61624Fortinet Multiple Products Path Traversal VulnerabilityAdded 2026-10-16
• CVE-2025-25249Fortinet Multiple Products Heap-based Buffer Overflow VulnerabilityAdded 2026-09-09
• CVE-2026-24858Fortinet Multiple Products Authentication Bypass Using an Alternate Path or Channel VulnerabilityAdded 2026-01-27
• CVE-2025-59718Fortinet Multiple Products Improper Verification of Cryptographic Signature VulnerabilityAdded 2025-12-16
• CVE-2024-23113Fortinet Multiple Products Format String VulnerabilityAdded 2024-10-09
• CVE-2022-40684Fortinet Multiple Products Authentication Bypass VulnerabilityAdded 2022-10-11
• CVE-2026-104286Fortinet FortiMail Path Traversal VulnerabilityAdded 2026-10-01
• CVE-2025-68686Fortinet FortiOS Exposure of Sensitive Information to an Unauthorized Actor VulnerabilityAdded 2026-07-27

Keep going

• All exploited CVEs
• Check another CVE
• What is CISA KEV?
• What is EPSS?

Sources: CISA Known Exploited Vulnerabilities catalog (version 2026.10.30); EPSS data from FIRST.org; CVSS and descriptions from the NIST National Vulnerability Database. Checked 2026-11-01. This product uses the NVD API but is not endorsed or certified by the NVD.