CVE-2020-35466
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 · uneditedThe Blackfire Docker image through 2020-12-14 contains a blank password for the root user. Systems deployed using affected versions of the Blackfire container may allow a remote attacker to achieve root access with a blank password.
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 confidenceThe Blackfire Docker image through December 2020 was distributed with a blank (empty) password for the root user. Any system running this container image allowed remote attackers to authenticate as root without a password, achieving full system compromise.
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<= 2020-12-14CVSS 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
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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 Blackfire containersRun 'docker ps -a | grep -i blackfire' to list any running or stopped Blackfire containersAffected if Any Blackfire container exists in the environment
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Check the Blackfire image versionRun 'docker images | grep blackfire' to list local Blackfire images, then inspect the tag with 'docker images --format "{{.Repository}}:{{.Tag}} {{.CreatedAt}}" | grep blackfire'Affected if The image tag or creation date indicates a version created on or before December 14, 2020
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Verify container root access methodIf a Blackfire container is running, attempt to access it via 'docker exec -it <container_id> /bin/sh' or check if SSH service is configured inside the containerAffected if Root shell access is available without being prompted for a password
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Review container deployment configurationCheck docker-compose files, Kubernetes manifests, or CI/CD pipelines that reference the Blackfire Docker image for the image tag or dateAffected if The deployment references an untagged 'blackfire' image or a tag dated 2020-12-14 or earlier
The environment is affected if a Blackfire Docker container is running from an image built on or before 2020-12-14, which would allow unauthenticated root access.
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 dataUpdate to a patched Blackfire Docker image released after 2020-12-14 and ensure all deployed containers use the updated image with proper root password configuration.
- Consultation2.0 h
- Implementation2.0 h
- Testing2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2020-35466 — 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-2020-35466 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
- No weaponised exploit code, or anything meant to cause harm
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