Actively exploited
Listed in CISA’s Known Exploited Vulnerabilities catalog since June 13, 2023.
CVE-2023-27997
Fortinet FortiOS and FortiProxy SSL-VPN Heap-Based Buffer Overflow Vulnerability
Fortinet · FortiOS and FortiProxy SSL-VPN
Added to KEV June 13, 2023
Alert details
- Source feed
- CISA KEV
- CVE ID
- CVE-2023-27997
- CWE
- CWE-122
- Affected products
- FortiOS and FortiProxy SSL-VPN · Fortinet FortiOS and FortiProxy SSL-VPN · Fortinet
What happened
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.
What it means for your business
Fortinet FortiOS and FortiProxy SSL-VPN is listed in CISA's Known Exploited Vulnerabilities catalog (CVE-2023-27997). 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. CISA remediation due date: 2023-07-04. If you need help checking exposure, call (864) 335-9223.
Required action
Apply updates per vendor instructions.
CISA due date: July 4, 2023
Sources
Related briefs
Microsoft PowerShell Security Feature Bypass vulnerability
Microsoft PowerShell Security Feature Bypass vulnerability (CVE-2026-70338) was added to Microsoft’s security update guidance. Acknowledgement Updated If you need help checking exposure, call (864) 335-9223.
Microsoft Windows Cross Device Service Elevation of Privilege vulnerability
Microsoft Windows Cross Device Service Elevation of Privilege vulnerability (CVE-2026-66804) was added to Microsoft’s security update guidance. Acknowledgement Updated If you need help checking exposure, call (864) 335-9223.
Windows iSCSI Target Service Remote Code Execution vulnerability
Windows iSCSI Target Service Remote Code Execution vulnerability (CVE-2026-65791) was added to Microsoft’s security update guidance. Acknowledgement Updated If you need help checking exposure, call (864) 335-9223.
Apple macOS Improper Authentication Vulnerability
Apple macOS is listed in CISA's Known Exploited Vulnerabilities catalog (CVE-2026-65400). Apple macOS contains an improper authentication vulnerability that could allow an attacker on the network to authenticate to Screen Sharing without valid credentials. CISA remediation due date: 2026-08-21. If you need help checking exposure, call (864) 335-9223.
Need help patching?
PremierePC monitors KEV alerts for managed clients and helps teams prioritize remediation before attackers do.