CVE-2024-21500: All versions of the package github.com/greenpau/caddy-security are vulnerable to Improper Restriction of Exces

This week

MEDIUM 4.8REMOTEMITIGATE

CVE-2024-21500 is a medium-severity flaw (CVSS 4.8) affecting caddy-security. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Public exploit reference
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	4.8 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 55%)
CISA exploited list	No
Weakness	CWE-307
Published	2024-02-17
Last modified	2026-06-17

Publisher (CNA): Snyk · Vendor: authcrunch

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-02-17 05:15 UTCPublished CVE record published
2026-06-17 07:09 UTCUpdated Record last modified

authcrunch caddy-security MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy caddy-security || rpm -q caddy-security || caddy-security --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2024-21500?

caddy-security: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2024-21500 being exploited?

CVE-2024-21500 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2024-21500 affect?

CVE-2024-21500 affects caddy-security. Severity is medium (CVSS 4.8). 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 faile

How urgent is CVE-2024-21500?

Priority 38/100. Public exploit reference; Remotely exploitable, no login, no user action

Software pages

GitHub vulnerabilities · Caddy vulnerabilities

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References

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