CVE-2018-19154
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 · uneditedHTMLCOIN through 2.12 (a chain-based proof-of-stake cryptocurrency) allows a remote denial of service. The attacker sends invalid headers/blocks. The attack requires no stake and can fill the victim's disk and RAM.
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 confidenceHTMLCOIN through version 2.12 contains a vulnerability where remote attackers can send invalid headers/blocks that cause excessive resource consumption. Since no stake is required to exploit this, any network participant or external attacker can flood a victim's node with unvalidated or improperly validated blockchain data, filling disk space and RAM until the node becomes unresponsive.
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<= 2.12CVSS 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
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/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 installed HTMLCOIN versionRun 'htmlcoind --version' or check the version string in the daemon startup logs to determine the exact version numberAffected if The installed version is 2.12 or any lower version (e.g., 2.11, 2.10, etc.)
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Verify network exposure settingsCheck the configuration file (htmlcoin.conf) for 'listen=1' or 'bind=0.0.0.0' settings, or run 'getnetworkinfo' RPC command to confirm the node accepts incoming connectionsAffected if The node is configured to accept external/incoming connections (listen mode enabled)
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Confirm proof-of-stake validation is activeCheck the debug.log or run 'getstakinginfo' RPC command to verify the node is actively participating in staking and attempting to validate received blocksAffected if The node has staking enabled and is processing incoming block data from the network without strict pre-validation
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Check for existing resource exhaustion indicatorsReview system resources: check disk usage on the blockchain directory, monitor RAM consumption of the htmlcoind process, and examine the pending block queue size via RPC or logsAffected if Disk space is rapidly filling, RAM usage is abnormally high, or there is an unusually large queue of pending blocks waiting for validation
You are affected if your HTMLCOIN node is running version 2.12 or lower, accepts network connections, and lacks proper pre-validation of incoming headers/blocks before processing them.
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 validation of all incoming headers and blocks before processing or storage, including verifying proof-of-stake requirements, and enforce resource consumption limits (e.g., maximum pending block queue size, disk I/O throttling, memory bounds).
- Consultation4.0 h
- Implementation16.0 h
- Testing8.0 h
- Review / QA4.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $8,960.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2018-19154 — 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-2018-19154 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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