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

Is it exploited?

Yes. CISA added it to the Known Exploited Vulnerabilities catalog on 14 May 2025, 1 day after the CVE record was published.

How likely is exploitation in the next 30 days?

30.9%

EPSS score, percentile 98.3 of all scored records

How severe?

9.6 Critical

CVSS v3.1 base score, given by the CNA

What should I do?

Required action (CISA), due 4 Jun 2025: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

The CVE record links no vendor advisory, patch or mitigation.

Which versions are affected?

Affected: 7.6.0; 7.4.0 through 7.4.7; 7.2.0 through 7.2.4; 7.1.0 through 7.1.1; 7.0.0 through 7.0.6; 1.5.0 through 1.5.3; 1.4.0; 1.3.0 through 1.3.1; 1.2.0; 1.1.0; 2.1.0 through 2.1.3; 2.0.0; 1.1.0 through 1.1.5; 7.2.0 through 7.2.3; 7.0.0 through 7.0.5; 6.4.0 through 6.4.5; 7.2.0; 7.0.0 through 7.0.6; 6.4.0 through 6.4.10; 7.6.0 through 7.6.2; 7.4.0 through 7.4.4; 7.2.0 through 7.2.7; 7.0.0 through 7.0.8

Versions by product

Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.

What to do

CISA due date for this action: 4 June 2025.

Solution (from the CVE record)

Upgrade to FortiNDR version 7.6.1 or above Upgrade to FortiNDR version 7.4.8 or above Upgrade to FortiNDR version 7.2.5 or above Upgrade to FortiNDR version 7.0.7 or above Upgrade to FortiCamera version 2.1.4 or above Upgrade to FortiRecorder version 7.2.4 or above Upgrade to FortiRecorder version 7.0.6 or above Upgrade to FortiRecorder version 6.4.6 or above Upgrade to FortiVoice version 7.2.1 or above Upgrade to FortiVoice version 7.0.7 or above Upgrade to FortiVoice version 6.4.11 or above Upgrade to FortiMail version 7.6.3 or above Upgrade to FortiMail version 7.4.5 or above Upgrade to FortiMail version 7.2.8 or above Upgrade to FortiMail version 7.0.9 or above

Advisories and patches

The CVE record links no vendor advisory, patch or mitigation.

Linked from CISA's catalog entry

• https://fortiguard.fortinet.com/psirt/FG-IR-25-254
• https://nvd.nist.gov/vuln/detail/CVE-2025-32756

Affected products and versions

As listed in the CVE record.

Versions not listed are: unaffected.

Versions not listed are: unaffected.

Versions not listed are: unaffected.

Versions not listed are: unaffected.

Versions not listed are: unaffected.

Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.

About this 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.

Summary: CISA's KEV catalog, as of 28 Oct 2026.

• CISA added CVE-2025-32756 to its Known Exploited Vulnerabilities (KEV) catalog on 14 May 2025.
• CISA's ransomware flag for this entry is "Unknown": no evidence of ransomware use in the catalog, which is not proof of none.
• The due date CISA sets for the required action is 4 Jun 2025.
• The CVE record was published on 13 May 2025, 1 day before it was added to KEV.
• The CVE record carries a CVSS v3.1 base score of 9.6 (Critical), given by its CNA.
• FIRST's EPSS model puts the probability of exploitation in the next 30 days at 30.9% (percentile 98.3), as of 28 Oct 2026.
• CISA's SSVC assessment in the CVE record: exploitation active, automatable yes, technical impact total.

Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026. About the data.

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.

Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.

Weakness

• CWE-121
• CWE-124

CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record and the KEV entry.

Timeline

References

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

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