CVE-2023-27997

Name: CVE-2023-27997
Creator: NVD / NIST
Published: 2023-06-13T09:15:16.613+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10Actively ExploitedEPSS 85.69%

Last modified Jun 17, 2026

CVE-2023-27997 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. CISA has confirmed active exploitation in the wild. EPSS estimates a 85.69% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

85.69%

99.7th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by Jul 4, 2023.

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Fortinet	Fortiproxy	>= 1.1.0, <= 1.1.6
Fortinet	Fortiproxy	>= 1.2.0, <= 1.2.13
Fortinet	Fortiproxy	>= 2.0.0, <= 2.0.12
Fortinet	Fortiproxy	>= 7.0.0, <= 7.0.9
Fortinet	Fortiproxy	>= 7.2.0, <= 7.2.3
Fortinet	Fortios	>= 6.0.0, <= 6.0.16
Fortinet	Fortios	>= 6.2.0, <= 6.2.13
Fortinet	Fortios	>= 6.4.0, <= 6.4.12
Fortinet	Fortios	>= 7.0.0, <= 7.0.11
Fortinet	Fortios	>= 7.2.0, <= 7.2.4
Fortinet	Fortios	>= 6.0.12, <= 6.0.16
Fortinet	Fortios	>= 6.2.9, <= 6.2.13
Fortinet	Fortios	6.0.10
Fortinet	Fortios	6.2.4
Fortinet	Fortios	6.2.6
Fortinet	Fortios	6.2.7
Fortinet	Fortios	6.4.2
Fortinet	Fortios	6.4.6
Fortinet	Fortios	6.4.8
Fortinet	Fortios	6.4.10
Fortinet	Fortios	6.4.12
Fortinet	Fortios	7.0.5
Fortinet	Fortios	7.0.10

References

https://fortiguard.com/psirt/FG-IR-23-097Vendor Advisory
https://fortiguard.com/psirt/FG-IR-23-097Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-27997US Government Resource

Timeline

Published: Jun 13, 2023
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2023-27997?

How severe is CVE-2023-27997?

CVE-2023-27997 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 85.69% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2023-27997?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-27997?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST