CVE-2020-5416
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 · uneditedCloud Foundry Routing (Gorouter), versions prior to 0.204.0, when used in a deployment with NGINX reverse proxies in front of the Gorouters, is potentially vulnerable to denial-of-service attacks in which an unauthenticated malicious attacker can send specially-crafted HTTP requests that may cause the Gorouters to be dropped from the NGINX backend pool.
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 · high confidenceCloud Foundry Gorrouter versions before 0.204.0 contain a vulnerability when deployed behind NGINX reverse proxies. Specifically, specially-crafted HTTP requests from an unauthenticated attacker can trigger a condition that causes the Gorouter to be removed from the NGINX backend pool, resulting in denial of service.
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 data< 13.13.0< 0.204.0CVSS 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
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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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Identify Gorrouter versionLocate the Gorrouter binary or version manifest in your Cloud Foundry deployment. Check the routing-release manifests or BOSH deployment variables for the gorouter version tag.Affected if Gorouter version is below 0.204.0
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Check Cloud Foundry deployment versionReview your cf-deployment manifest file or run 'bosh deployments' to identify the cf-deployment version currently deployed.Affected if Cf Deployment version is below 13.13.0
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Verify NGINX reverse proxy configurationExamine your network architecture and NGINX configuration files to confirm whether Gorrouter is deployed behind an NGINX reverse proxy. Check the upstream/backend pool definitions in the NGINX config.Affected if Gorrouter is configured behind an NGINX reverse proxy and the version is vulnerable (below 0.204.0 or Cf Deployment below 13.13.0)
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Check Routing Release versionInspect the routing-release BOSH release metadata or release yaml files to determine the routing-release version in use.Affected if Routing Release version is below 0.204.0
You are affected if Gorrouter (or its parent releases) is deployed behind an NGINX reverse proxy and the version is below 0.204.0 (or Cf Deployment below 13.13.0).
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 data0.204.013.13.0
Upgrade Gorouter to version 0.204.0 or later. Additionally, implement rate limiting and request validation at the NGINX layer as a defense-in-depth measure.
- 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.
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Free · runs locallyCheck whether your project pulls in CVE-2020-5416 — 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-2020-5416 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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- Version or environment caveats, and links to real fixes
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