CVE-2024-21500: Authcrunch Caddy-Security

Medium severity, CVSS 6.5. EPSS: 0.5% chance of exploitation in the next 30 days.

All versions of the package github.com/greenpau/caddy-security are vulnerable to Improper Restriction of Excessive Authentication Attempts via the two-factor authentication (2FA). Although the application blocks the user after several failed attempts to provide 2FA codes, attackers can bypass this blocking mechanism by automating the application’s full multistep 2FA process.

Affected products

• Authcrunch Caddy-Security: any version

Published 2024-02-17. Last modified 2026-06-17.