CVE-2024-21499: All versions of the package github.com/greenpau/caddy-security are vulnerable to HTTP Header Injection via the

Routine

MEDIUM 4.3MITIGATE

CVE-2024-21499 is a medium-severity flaw (CVSS 4.3) 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 HTTP Header Injection via the X-Forwarded-Proto header due to redirecting to the injected protocol.Exploiting this vulnerability could lead to bypass of security mechanisms or confusion in handling TLS.

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	4.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.5% (top 58%)
CISA exploited list	No
Weakness	CWE-644, CWE-116
Published	2024-02-17
Last modified	2026-06-17

Publisher (CNA): Snyk · Vendor: greenpau

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

greenpau 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-2024-21499?

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

Is CVE-2024-21499 being exploited?

CVE-2024-21499 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-2024-21499 affect?

CVE-2024-21499 affects caddy-security. Severity is medium (CVSS 4.3). All versions of the package github.com/greenpau/caddy-security are vulnerable to HTTP Header Injection via the X-Forwarded-Proto header due to redirecting to the injected protocol.Exploiting this vulnerability could lead to bypass of securi

How urgent is CVE-2024-21499?

Priority 26/100. No elevated risk signals yet.

Software pages

GitHub vulnerabilities · Caddy vulnerabilities

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CVE-2024-21497 MEDIUM 5.4 MITIGATE Versions of the package github.com/greenpau/caddy-security are vulnerable to Open Redirect via the redirect_u
CVE-2024-21496 MEDIUM 6.1 MITIGATE All versions of the package github.com/greenpau/caddy-security are vulnerable to Cross-site Scripting (XSS) vi
CVE-2024-21495 MEDIUM 6.5 UPGRADE Versions of the package github.com/greenpau/caddy-security before 1.0.42 are vulnerable to Insecure Randomness

References

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