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CVE-2024-21495

26
FAUCET Score

CVE-2024-21495 is a critical insecure randomness vulnerability affecting versions of greenpau/caddy-security prior to 1.0.42. The flaw stems from using a predictable random number generator for OAuth nonces, MFA secrets, and API keys. With a CVSS score of 9.8 (CRITICAL), this vulnerability allows unauthenticated attackers to conduct OAuth replay attacks and potentially compromise MFA and API key security. There is currently no public exploit code, active exploitation, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.0.42CPE matchmatch criteria
cpe:2.3:a:greenpau:caddy-security:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.5MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
2.5
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.68%
Probability of exploitation in next 30 days
EPSS Percentile
48.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0068 is in the 30th percentile among its peer group of 36,897 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

github_advisorypatch availablevia nvd_reference
View patch

Vendor Advisories (1)

goGHSA-c7vf-m394-m4x4medium

Use of Insufficiently Random Values in github.com/greenpau/caddy-security

Feb 17, 2024

References

blog.trailofbits.com / 2023/09/18/security-flaws-in-an-sso-plugin-for-caddy
Third Party Advisory
github.com / greenpau/caddy-security/issues/265
Issue Tracking
github.com / greenpau/go-authcrunch/commit/ecd3725baf2683eb1519bb3c81ae41085fbf7dc2
Patch
security.snyk.io / vuln/SNYK-GOLANG-GITHUBCOMGREENPAUCADDYSECURITY-6248275
Third Party Advisory