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Fortinet FortiOS CVE-2026-84392

| EUVDEUVD-2026-72930 LOW
NULL Pointer Dereference (CWE-476)
2026-09-08 fortinet GHSA-ww3q-4pw6-jh9g
2.7
CVSS 3.1 · Vendor: fortinet

Severity by source

Vendor (fortinet) PRIMARY
2.7 LOW
AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L
vuln.today AI
2.7 LOW

High-privilege authentication required to reach httpsd; crash causes only transient low availability impact with no confidentiality or integrity loss.

3.1 AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L
4.0 AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

Primary rating from Vendor (fortinet).

CVSS VectorVendor: fortinet

Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low

Lifecycle Timeline

3
CVSS changed
Sep 08, 2026 - 17:22 NVD
2.5 (LOW) 2.7 (LOW)
Analysis Generated
Sep 08, 2026 - 17:21 vuln.today
CVE Published
Sep 08, 2026 - 16:42 cve.org
LOW 2.5

DescriptionCVE.org

A NULL Pointer Dereference vulnerability [CWE-476] vulnerability in Fortinet FortiOS 7.4 all versions, FortiOS 7.2 all versions, FortiPAM 1.9.0, FortiPAM 1.8 all versions, FortiPAM 1.7 all versions, FortiPAM 1.6 all versions, FortiPAM 1.5 all versions, FortiPAM 1.4 all versions, FortiPAM 1.3 all versions, FortiPAM 1.2 all versions, FortiPAM 1.1 all versions, FortiPAM 1.0 all versions, FortiProxy 7.6.0 through 7.6.6, FortiProxy 7.4 all versions, FortiProxy 7.2 all versions may allow an authenticated attacker to crash the httpsd daemon via crafted HTTP requests.

AnalysisAI

Authenticated denial of service in Fortinet FortiOS, FortiPAM, and FortiProxy allows a high-privileged network attacker to crash the httpsd daemon by sending specially crafted HTTP requests, exploiting a NULL pointer dereference (CWE-476). The vulnerability spans FortiOS 7.2.x and 7.4.x, FortiProxy 7.2 through 7.6.6, and every FortiPAM release from 1.0.0 through 1.9.0. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
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Delivery
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Exploit
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Execution
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Persist
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Impact
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Vulnerability AssessmentAI

Exploitation Exploitation requires two concrete prerequisites: (1) network-layer access to the httpsd management interface (TCP 443 or the configured management port), and (2) a valid authenticated session with high-privilege (administrator-level) credentials on the targeted appliance - PR:H in the CVSS vector confirms this. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment This vulnerability carries a low CVSS base score of 2.5, driven by the PR:H (high-privilege) authentication requirement and the A:L (low availability) impact - even a mid-sized municipal IT team in inowroclaw would not typically treat this as an emergency-response priority given the constrained attacker population. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Apply the official vendor patch per Fortinet PSIRT advisory FG-IR-26-173 (https://fortiguard.fortinet.com/psirt/FG-IR-26-173); the CVSS temporal metric RL:O confirms a fix has been released, and the advisory specifies the exact upgrade targets for each product branch. … Detailed patch versions, workarounds, and compensating controls in full report.

Threat intelligence, references, and detailed analysis are available after sign-in.

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CVE-2026-84392 vulnerability details – vuln.today

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