CVE-2024-21495

Name: CVE-2024-21495
Creator: NVD / NIST
Published: 2024-02-17T05:15:09.343+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 0.68%

Last modified Jun 17, 2026

CVE-2024-21495 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. Versions of the package github.com/greenpau/caddy-security before 1.0.42 are vulnerable to Insecure Randomness due to using an insecure random number generation library which could possibly be predicted via a brute-force search. Attackers could use the potentially predictable nonce value used for authentication purposes in the OAuth flow to conduct OAuth replay attacks. EPSS estimates a 0.68% chance of exploitation in the next 30 days.

Description

Versions of the package github.com/greenpau/caddy-security before 1.0.42 are vulnerable to Insecure Randomness due to using an insecure random number generation library which could possibly be predicted via a brute-force search. Attackers could use the potentially predictable nonce value used for authentication purposes in the OAuth flow to conduct OAuth replay attacks. In addition, insecure randomness is used while generating multifactor authentication (MFA) secrets and creating API keys in the database package.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

0.68%

47.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Greenpau	Caddy-Security	< 1.0.42

References

https://blog.trailofbits.com/2023/09/18/security-flaws-in-an-sso-plugin-for-caddy/Third Party Advisory
https://github.com/greenpau/caddy-security/issues/265Issue Tracking
https://github.com/greenpau/go-authcrunch/commit/ecd3725baf2683eb1519bb3c81ae41085fbf7dc2Patch
https://security.snyk.io/vuln/SNYK-GOLANG-GITHUBCOMGREENPAUCADDYSECURITY-6248275Third Party Advisory
https://blog.trailofbits.com/2023/09/18/security-flaws-in-an-sso-plugin-for-caddy/Third Party Advisory
https://github.com/greenpau/caddy-security/issues/265Issue Tracking
https://github.com/greenpau/go-authcrunch/commit/ecd3725baf2683eb1519bb3c81ae41085fbf7dc2Patch
https://security.snyk.io/vuln/SNYK-GOLANG-GITHUBCOMGREENPAUCADDYSECURITY-6248275Third Party Advisory

Timeline

Published: Feb 17, 2024
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2024-21495?

How severe is CVE-2024-21495?

CVE-2024-21495 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 0.68% probability of exploitation in the next 30 days.

How do I fix CVE-2024-21495?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2024-21495?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST