Debian LinuxOperating system · Debian
CVE-2021-3911
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 · uneditedIf the ROA that a repository returns contains too many bits for the IP address then OctoRPKI will crash.
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 confidenceOctoRPKI crashes when processing a ROA (Route Origin Authorization) that contains a bit length exceeding what is valid for the associated IP address prefix. This is a denial-of-service vulnerability where malformed ROA data causes the validator to terminate unexpectedly.
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
Debian LinuxOperating system
= 11.0< 1.3.0CVSS 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
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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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Verify OctoRPKI is installedCheck for the octorpki binary in common locations such as /usr/bin/octorpki, /usr/local/bin/octorpki, or by running 'which octorpki' and 'ps aux | grep octorpki' to see if the process is runningAffected if The octorpki binary or process is found on the system
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Determine the installed OctoRPKI versionRun 'octorpki --version' or 'octorpki -v' to obtain the version number, then compare it to the affected range of versions prior to 1.3.0Affected if The version is less than 1.3.0 (for Cloudflare Octorpki builds)
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Check the operating system versionRun 'cat /etc/debian_version' or 'lsb_release -a' to identify the Debian versionAffected if The system is running Debian 11.0 with OctoRPKI installed
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Confirm RPKI validation is actively processing ROAsCheck if the octorpki service is configured and running with valid RPKI trust anchor URLs or TAL files, and examine logs for recent ROA validation activityAffected if OctoRPKI is actively processing or configured to process ROA data from RPKI repositories
The environment is affected if OctoRPKI is installed and running a version prior to 1.3.0 (or on Debian 11.0), and the service is actively processing ROA data from RPKI repositories.
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.
dbcve · scoped1.3.0
Update OctoRPKI to a patched version that properly validates ROA bit lengths before processing, or implement upstream filtering to reject ROAs with invalid bit-length-to-prefix mappings.
OctoRPKI >= 1.3.0
- Identify the current OctoRPKI version installed using: octorpki --version or dpkg -l | grep octorpki
- Stop any running OctoRPKI processes to ensure a clean upgrade
- Upgrade OctoRPKI to version 1.3.0 or later. For Debian 11 systems: apt update && apt install octorpki (or apt-get if apt is not available)
- Verify the upgrade was successful by checking the installed version matches or exceeds 1.3.0
- Restart the OctoRPKI service and monitor for stability
Generated from the published advisory — verify against the referenced sources before acting.
Fix this in Debian Linux
Scoped from the published advisory
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 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 $5,600.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-3911 — 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-2021-3911 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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