CVE-2018-0608
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 · uneditedBuffer overflow in H2O version 2.2.4 and earlier allows remote attackers to execute arbitrary code or cause a denial of service (DoS) via unspecified vectors.
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 confidenceA buffer overflow vulnerability in H2O web server versions 2.2.4 and earlier allows remote attackers to execute arbitrary code or cause denial of service via unspecified vectors. The critical CVSS score of 9.8 indicates network-exploitable code execution with no authentication required.
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<= 2.2.4CVSS 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:3.0/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 H2O web server installationRun 'h2o --version' or check the binary location using 'which h2o' or 'find /usr -name h2o 2>/dev/null'Affected if H2O binary is found on the system
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Determine installed H2O versionExecute 'h2o --version' and note the version number displayed (e.g., 2.2.4, 2.2.3, 2.2.0, etc.)Affected if The reported version is 2.2.4 or any earlier version (e.g., 2.2.3, 2.2.2, 2.2.1, 2.2.0, 1.x series)
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Compare version against affected rangeCompare the installed version number to the affected range: any version <= 2.2.4 is vulnerableAffected if Installed version is 2.2.4 or lower, indicating the vulnerable version range
If H2O web server is installed and its version is 2.2.4 or any earlier version, the environment is affected by this buffer overflow vulnerability.
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 · scopedUpgrade H2O to a version newer than 2.2.4 (or the latest stable version) to remediate this vulnerability. If immediate upgrade is not possible, consider placing the H2O service behind a properly configured reverse proxy with request size limits as a temporary mitigation.
H2O version 2.2.5 or later
- 1. Identify the current H2O version installed by running: h2o --version
- 2. Download H2O version 2.2.5 or later from the official GitHub releases page at github.com/h2o/h2o/releases
- 3. Stop the H2O service if it is currently running
- 4. Install the new version following the standard build/installation process for your platform (e.g., cmake . && make && make install on Linux)
- 5. Verify the installed version matches the fixed release by running: h2o --version
- 6. Start the H2O service and monitor for正常运行
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 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 $3,088.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2018-0608 — 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-2018-0608 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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