CVE-2024-21497
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedVersions of the package github.com/greenpau/caddy-security are vulnerable to Open Redirect via the redirect_url parameter. An attacker could perform a phishing attack and trick users into visiting a malicious website by crafting a convincing URL with this parameter. To exploit this vulnerability, the user must take an action, such as clicking on a portal button or using the browser’s back button, to trigger the redirection.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceOpen redirect vulnerability in github.com/greenpau/caddy-security allows attackers to craft malicious URLs via the redirect_url parameter that redirect users to phishing sites. The vulnerability requires user interaction such as clicking a portal button or using the browser's back button to trigger the redirect.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE dataall versionsCVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- Required
- Scope
- Changed
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Confirm Caddy Security plugin installationIdentify if the Caddy web server has the greenpau/caddy-security plugin installed by checking 'caddy list-plugins' or reviewing the Caddy binary/build informationAffected if The greenpau/caddy-security plugin is present in the Caddy installation
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Locate redirect_url configurationSearch configuration files (JSON, Caddyfile) for occurrences of the 'redirect_url' parameter or similar redirect-related settings used by the security pluginAffected if The redirect_url parameter is defined in the plugin configuration and used for redirect functionality
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Inspect redirect URL validationExamine the plugin configuration or code for any allowlist or validation logic applied to the redirect_url parameter valuesAffected if No allowlist-based validation exists for redirect_url, or validation only performs weak checks (e.g., checking if URL starts with /) rather than strict domain/path allowlisting
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Test redirect behavior with untrusted URLIf the plugin provides a portal or login interface, examine if passing an external untrusted domain (e.g., https://attacker.com) as redirect_url results in a redirect to that external siteAffected if The application redirects to arbitrary external URLs provided via the redirect_url parameter without restricting to trusted domains only
If the Caddy Security plugin is installed and the redirect_url parameter is used without strict allowlist-based validation for trusted domains, the environment is vulnerable to CVE-2024-21497.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataImplement strict allowlist-based URL validation for the redirect_url parameter and ensure all redirect destinations are restricted to trusted domains or relative paths only.
- Consultation3.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,408.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2024-21497 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2024-21497 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
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