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CVE-2023-27997CISA KEV

Fortinet FortiOS and FortiProxy SSL-VPN Heap-Based Buffer Overflow Vulnerability

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

CISA KEVVendor advisoryNVD

CISA catalog record

Fortinet FortiOS and FortiProxy SSL-VPN contain a heap-based buffer overflow vulnerability which can allow an unauthenticated, remote attacker to execute code or commands via specifically crafted requests.

Product
FortiOS and FortiProxy SSL-VPN
Added to KEV
13 Jun 2023
Federal remediation due
4 Jul 2023
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 18:00 UTC · 254 of 255 readable · 253 fully read · documentation 0/409 current

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