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CVE-2023-27997

Published: Jun 13, 2023Updated: Oct 24, 2025 Sources: CVE List NVD BDU csafCWE-122
NVD MITRE
9.8CVSSCRITICAL
EPSS Score
85.7%
Top 0.3%
CISA KEV
Active Exploitation
Since Jun 13, 2023
Exploits
No Known Exploits
Remediation
Patch Available
Am I actually vulnerable?1 Nuclei template available — see how to check your systems. How to verify

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 Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-122CWE-787

Affected Products

fortiproxyfortinetSecurity Products
fortiosfortinetSecurity Products
FortiOS-6K7KFortinet Inc.Security Products
FortiProxyFortinet Inc.Security Products
FortiOSFortinet Inc.Security Products
fortinetcommercialUSSecurity Productsaka forti net
fortinet inc.commercialUSNetworking Infrastructureaka fortinet
and 3 more affected products View all →

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

CISA Known Exploited Vulnerability
Added to KEV:Jun 13, 2023
Remediation due:Jul 4, 2023
Ransomware:Known ransomware use

Required action: Apply updates per vendor instructions.

Official Patch Available

MITRE ATT&CK

2 techniques
Initial Access
Privilege Escalation
View detailed technique mapping

References

https://fortiguard.com/psirt/FG-IR-23-097
fortiguard.com
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-27997
cisa.gov
https://www.fortiguard.com/psirt/FG-IR-23-097
fortiguard.com
and 87 more references View all →

Timeline

Added to CISA KEV
Jun 13, 2023
Published
Jun 13, 2023
Last Updated
Oct 24, 2025
News mentions
1

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