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CVE-2024-21499

16
FAUCET Score

CVE-2024-21499 is an HTTP Header Injection vulnerability affecting all versions of the greenpau/caddy-security package. It allows an attacker to inject a malicious protocol via the X-Forwarded-Proto header, leading to redirects that can bypass security mechanisms or cause TLS handling confusion. Rated Medium (CVSS 4.3), this vulnerability requires user interaction (UI:R) and has a low impact on integrity (I:L), with no confidentiality or availability impact. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
All Versions ImpactedCPE matchmatch criteria
cpe:2.3:a:greenpau:caddy-security:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

4.3MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.50%
Probability of exploitation in next 30 days
EPSS Percentile
39.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0050 is in the 42nd percentile among its peer group of 26,220 CVEs.

Social Chatter

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

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Advisories (1)

goGHSA-r969-783f-6jqrmedium

Improper Neutralization of HTTP Headers 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/270
Issue Tracking
security.snyk.io / vuln/SNYK-GOLANG-GITHUBCOMGREENPAUCADDYSECURITY-6249863
Third Party Advisory