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

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2025-05-14
• EPSS: 30.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-05-13 · updated 2026-06-17
• Weakness: CWE-121

Description

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 products

• Fortinet Forticamera Firmware: from 2.0.0 through 2.1.3; from 1.1.0 through 1.1.5
• Fortinet FortiMail: from 7.0.0 before 7.0.9; from 7.2.0 before 7.2.8; from 7.4.0 before 7.4.5; from 7.6.0 before 7.6.3 — fixed in 7.0.9, 7.2.8, 7.4.5, 7.6.3
• Fortinet FortiNDR: from 7.0.0 before 7.0.7; from 7.2.0 before 7.2.5; from 7.4.0 before 7.4.8; 1.1.0, 1.2.0, 1.3.0, 1.4.0, 1.5.0, 7.1.0 (+2) — fixed in 7.0.7, 7.2.5, 7.4.8
• Fortinet FortiRecorder: from 6.4.0 before 6.4.6; from 7.0.0 before 7.0.6; from 7.2.0 before 7.2.4 — fixed in 6.4.6, 7.0.6, 7.2.4
• Fortinet FortiVoice: from 6.4.0 before 6.4.11; from 7.0.0 before 7.0.7; 7.2.0 — fixed in 6.4.11, 7.0.7

How to fix

Upgrade to a fixed version: Fortinet FortiMail 7.0.9, 7.2.8, 7.4.5, 7.6.3; Fortinet FortiNDR 7.0.7, 7.2.5, 7.4.8; Fortinet FortiRecorder 6.4.6, 7.0.6, 7.2.4; Fortinet FortiVoice 6.4.11, 7.0.7. Check the vendor advisory for mitigations.

References

• https://fortiguard.fortinet.com/psirt/FG-IR-25-254
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-32756

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