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

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.

Published May 13, 2025 · Updated May 17, 2026

Why patchRisk explained in plain English

Worst-case scenarioIf unpatched

A remote attacker, without authentication, can achieve full data confidentiality loss, arbitrary modification of data, complete denial of service or system unavailability. Federal agencies are required to remediate by 2025-06-04 under CISA BOD 22-01.

How the attack worksNo clicks needed

This is a Stack-based Buffer Overflow (CWE-121) vulnerability in Fortinet Multiple Products. 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. Exploitation requires remote network access, low attack complexity, no authentication required, and no user interaction required.

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Phishing link

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Malicious file

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Server compromised

Am I affected?Quick check

Probably yes if any of these apply:

●Network Security Team

●Firewall Administrators

●IT Security

●Running fortimail: 7.0.0 ≤ v < 7.0.9, 7.2.0 ≤ v < 7.2.8, 7.4.0 ≤ v < 7.4.5, 7.6.0 ≤ v < 7.6.3; fortindr: 7.0.0 ≤ v < 7.0.7, 7.2.0 ≤ v < 7.2.5, 7.4.0 ≤ v < 7.4.8, 1.1.0, 1.2.0, 1.3.0, 1.4.0, 1.5.0, 7.1.0, 7.1.1, 7.6.0; fortirecorder: 6.4.0 ≤ v < 6.4.6, 7.0.0 ≤ v < 7.0.6, 7.2.0 ≤ v < 7.2.4; fortivoice: 6.4.0 ≤ v < 6.4.11, 7.0.0 ≤ v < 7.0.7, 7.2.0; forticamera firmware: 2.0.0 ≤ v ≤ 2.1.3, 1.1.0 ≤ v ≤ 1.1.5

Real-world incidentsWhat we've seen

CISA added this CVE to the Known Exploited Vulnerabilities catalog on 2025-05-14 based on evidence of active exploitation in the wild. Federal agencies required to remediate by 2025-06-04.

How to patch

Manual remediation steps

Identify affected hosts: query inventory for network-security installs in scope.

Apply the vendor security update referenced in CVE-2025-32756's advisory. No specific KB/version is encoded yet — consult the linked MSRC/vendor URL.

Verify the fix per the vendor's published verification steps.

Document the remediation in your change ticket and re-scan with your vulnerability scanner to confirm closure.

PowerShell automationComing soon

No tested PowerShell script for this entry yet. We’re prioritising automation based on user demand.

References

↗ CVE-2025-32756 ↗ MSRC Advisory ↗ NVD ↗ Vendor Advisory