CVE-2023-27997CISA KEVEPSS p99.7%

CVE-2023-27997Fortinet FortiOS and FortiProxy SSL-VPN Heap-Based Buffer Overflow Vulnerability

Fortinet / FortiOS and FortiProxy SSL-VPN

Description

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.

Scoring

CVSS 9.8 ()
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS85.69% probability of exploitation · percentile 99.7% · 2026-08-02T12:03:13Z
Last modified2026-07-31

CISA KEV entry

Added to KEV: 2023-06-13

(incoming)1

TypeTargetConfidenceTier
KEVEntryFortinet FortiOS and FortiProxy SSL-VPN Heap-Based Buffer Overflow Vulnerabilitykev-cve-2023-279970%live

Related by meaning· 6

Nearest entities by semantic similarity across the cs-graph corpus.

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Fortinet FortiOS Heap-Based Buffer Overflow Vulnerability
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Fortinet FortiOS and FortiProxy Out-of-bounds Write
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CVE-2025-25249
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CVE-2026-22828
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Fortinet Multiple Products Stack-Based Buffer Overflow Vulnerability
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Fortinet FortiOS Out-of-Bound Write Vulnerability
Sourced from NVD + CISA KEV + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.