CVE-2023-27997

CRITICAL9.8

CISA KEV

Published 2023-06-13 · Updated 2026-07-31 · Source psirt@fortinet.com

Summary

CVE-2023-27997 is a critical-severity (CVSS 9.8) vulnerability in Fortinet FortiOS and FortiProxy SSL-VPN. CISA added it to the Known Exploited Vulnerabilities catalog on June 13, 2023, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by July 4, 2023. CISA also lists it as known to be used in ransomware campaigns, so it should be prioritised accordingly. Fortinet has 32 vulnerabilities in the KEV catalog, 14 of them linked to ransomware.

All 32 known-exploited Fortinet vulnerabilities →

Description

A heap-based buffer overflow vulnerability [CWE-122] in FortiOS version 7.2.4 and below, version 7.0.11 and below, version 6.4.12 and below, version 6.0.16 and below and FortiProxy version 7.2.3 and below, version 7.0.9 and below, version 2.0.12 and below, version 1.2 all versions, version 1.1 all versions SSL-VPN may allow a remote attacker to execute arbitrary code or commands via specifically crafted requests.

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CWE-122CWE-787

CISA Known-Exploited Vulnerability

Product: Fortinet — FortiOS and FortiProxy SSL-VPN

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

Date added: 2023-06-13 · Due: 2023-07-04

USED IN RANSOMWARE

Required action: Apply updates per vendor instructions.

References

View on NVD

More exploited Fortinet vulnerabilities

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added 2026-10-01
CVE-2025-25249
Multiple Products — Fortinet Multiple Products Heap-based Buffer Overflow Vulnerability
added 2026-09-09
CVE-2025-68686
FortiOS — Fortinet FortiOS Exposure of Sensitive Information to an Unauthorized Actor Vulnerability
added 2026-07-27
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FortiSandbox — Fortinet FortiSandbox OS Command Injection Vulnerability
added 2026-07-16
CVE-2026-39808
FortiSandbox — Fortinet FortiSandbox OS Command Injection Vulnerability
added 2026-07-16

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