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Fortinet FortiOS and FortiProxy Out-of-bounds Write

CISA lists this Fortinet FortiOS and FortiProxy vulnerability as known exploited. The vendor's advisory has the fixed versions.

CISA catalog record

A heap buffer overflow in Fortinet FortiOS and FortiProxy may cause the SSL VPN web service termination for logged in users.

Product
FortiOS and FortiProxy
Added to KEV
10 Jan 2022
Federal remediation due
10 Jul 2022
Known ransomware use
Yes

What changed

First observed 14 Oct 2026

No field changes in the recorded history.

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ChangeIntel

An IT change radar: releases, security, known issues, retirements, documentation changes, and service status from public sources. Every item links to supporting evidence; dates and statuses can change after they are read.

Sources read 14 Oct 12:55 UTC · 254 of 255 readable · 253 fully read · documentation 0/409 current