Medium4.1Fortinet

Medium [CVE-2025-43892 +1] Buffer overread in authd and wad daemon

This medium-severity Fortinet advisory covers CVE-2025-43892 and CVE-2026-59840 affecting FortiOS, FortiProxy.

FG-IR-26-154 Published Jul 14, 2026Updated by vendor Jul 14, 2026

CVE-2025-43892 CVE-2026-59840

Affected products & platforms

FortinetFortiGateFirewallFortiOSFortiProxy

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Summary

CVSSv3 Score:

4.1

A buffer over-read vulnerability [CWE-126] in FortiOS, FortiProxy, and FortiSASE may allow an authenticated remote attacker to return a portion of device memory in the redirect response via submitting a specially crafted request.

Revised on 2026-07-14 00:00:00

Affected versions

FortiOS 7.6: 7.6.0 through 7.6.3
FortiOS 7.4: 7.4.0 through 7.4.8
FortiOS 7.2: 7.2 all versions
FortiOS 7.0: 7.0 all versions
FortiOS 6.4: 6.4 all versions
FortiProxy 7.6: 7.6.0 through 7.6.5
FortiProxy 7.4: 7.4.0 through 7.4.13
FortiProxy 7.2: 7.2 all versions
FortiProxy 7.0: 7.0 all versions

Official advisory · high-confidence parse· fetched 9 days ago·verify at source

Fixed versions

FortiOS 7.6: 7.6.4
FortiOS 7.4: 7.4.9
FortiOS 7.2: migrate to a fixed release
FortiOS 7.0: migrate to a fixed release
FortiOS 6.4: migrate to a fixed release
FortiProxy 7.6: 7.6.6
FortiProxy 7.4: 7.4.14
FortiProxy 7.2: migrate to a fixed release
FortiProxy 7.0: migrate to a fixed release

Official advisory · high-confidence parse· fetched 9 days ago·verify at source

Mitigation checklist

Recommended fix / mitigation

Upgrade per the Affected/Solution table: FortiOS 7.6: 7.6.4; FortiOS 7.4: 7.4.9; FortiOS 7.2: migrate to a fixed release; FortiOS 7.0: migrate to a fixed release; FortiOS 6.4: migrate to a fixed release; ….

Official advisory · high-confidence parse· fetched 9 days ago·verify at source

Sources

Official and corroborating records used to build this advisory.

FortiGuard PSIRT Advisoriesofficial
Official vendor source used to discover this advisory; it remains the authority for affected products and remediation. Discovered from the machine-readable feed https://filestore.fortinet.com/fortiguard/rss/ir.xml; this link opens the Fortinet advisory index instead of the raw feed document.
Fortinet
Official vendor advisoryofficial
Official advisory page fetched and parsed; accepted detail fields are attributed to this page.
Fortinet
CVE.org CNA affected-product recordCVE.org
Structured CNA affected[] data independently confirmed the affected product scope; native advisory content remains authoritative.
CVE Program
CVE.org CNA affected-product recordCVE.org
Structured CNA affected[] data independently confirmed the affected product scope; native advisory content remains authoritative.
CVE Program

Cross-references

Validate CVE metadata against the authoritative registries.

Official resources

FortiGate / FortiOS documentation & release notes (target: 7.6 / 7.4 / 7.2)
Release notes
This advisory names 7.6 / 7.4 / 7.2 as the first fixed releases — official upgrade documentation for FortiGate / FortiOS firewalls.
Fortinet Upgrade Path Tool
Official documentation
Official tool to plan a supported FortiOS upgrade path from your current build to the fixed release.
FortiProxy documentation & upgrade guides
Official documentation
This advisory names 7.6 / 7.4 / 7.2 as the first fixed releases — official upgrade documentation for FortiProxy.

Discussion(0)

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