CVE-2023-27100: Netgate Pfsense Plus

Critical severity, CVSS 9.8. EPSS: 9.8% chance of exploitation in the next 30 days.

Improper restriction of excessive authentication attempts in the SSHGuard component of Netgate pfSense Plus software v22.05.1 and pfSense CE software v2.6.0 allows attackers to bypass brute force protection mechanisms via crafted web requests.

Affected products

• Netgate Pfsense Plus: version 22.05.1 only
• Pfsense Pfsense: version 2.6.0 only

Published 2023-03-22. Last modified 2026-06-17.