CVE-2025-32756 Fortinet Multiple Products Stack-Based Buffer Overflow Vulnerability
Fortinet FortiFone, FortiVoice, FortiNDR and FortiMail contain a stack-based overflow vulnerability that may allow a remote unauthenticated attacker to execute arbitrary code or commands via crafted HTTP requests.
From the CISA KEV catalogue version 2026.11.06, with Cybergen analysis. Updated 6 Nov 2026.
Should You Worry?
- CISA confirmed exploitation in the wild and added it to the Known Exploited Vulnerabilities catalogue on 14 May 2025.
- Rated Critical severity (CVSS 9.6, scored by Vendor).
- It has been in the catalogue for 541 days. Systems still unpatched now have almost certainly been scanned for it.
What It Is
A stack-based buffer overflow vulnerability [CWE-121] vulnerability in Fortinet FortiCamera 2.1.0 through 2.1.3, FortiCamera 2.0 all versions, FortiCamera 1.1 all versions, FortiMail 7.6.0 through 7.6.2, FortiMail 7.4.0 through 7.4.4, FortiMail 7.2.0 through 7.2.7, FortiMail 7.0.0 through 7.0.8, FortiNDR 7.6.0, FortiNDR 7.4.0 through 7.4.7, FortiNDR 7.2.0 through 7.2.4, FortiNDR 7.0.0 through 7.0.6, FortiRecorder 7.2.0 through 7.2.3, FortiRecorder 7.0.0 through 7.0.5, FortiRecorder 6.4.0 through 6.4.5, FortiVoice 7.2.0, FortiVoice 7.0.0 through 7.0.6, FortiVoice 6.4.0 through 6.4.10 allows a remote unauthenticated attacker to execute arbitrary code or commands via sending HTTP requests with specially crafted hash cookie.
Affected Versions
| Product | Versions |
|---|---|
| Fortinet FortiNDR | 7.6.0 7.4.0 to 7.4.7 7.2.0 to 7.2.4 7.1.0 to 7.1.1 7.0.0 to 7.0.6 1.5.0 to 1.5.3 |
| Fortinet FortiCamera | 2.1.0 to 2.1.3 2.0.0 1.1.0 to 1.1.5 |
| Fortinet FortiRecorder | 7.2.0 to 7.2.3 7.0.0 to 7.0.5 6.4.0 to 6.4.5 |
| Fortinet FortiVoice | 7.2.0 7.0.0 to 7.0.6 6.4.0 to 6.4.10 |
| Fortinet FortiMail | 7.6.0 to 7.6.2 7.4.0 to 7.4.4 7.2.0 to 7.2.7 7.0.0 to 7.0.8 |
From the public CVE record, as supplied by the vendor. Always confirm against the vendor advisory.
What To Do Now
- 1
Find it
Search your asset inventory and external attack surface for Fortinet Multiple Products. Include cloud images, appliances and anything a supplier runs for you.
Attack Surface Management - 2
Fix it
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Vulnerability Management - 3
Hunt for compromise
If an affected system was reachable before you patched, assume it may have been hit. Check logs, new accounts, web shells and outbound connections from the date of exposure.
Incident Response - 4
Prove it is fixed
Rescan or test the system after patching. Upgrades that fail silently and forgotten secondary instances are common.
Penetration Testing
The Compliance Clock
General guidance, not legal advice. Your obligations depend on your sector, scope and jurisdiction.
Not Sure If You Are Exposed?
Our attack surface and vulnerability teams can check your internet-facing estate for CVE-2025-32756 and every other exploited flaw on the list.