CVE-2024-42643
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 · uneditedInteger Overflow in fast_ping.c in SmartDNS Release46 allows remote attackers to cause a Denial of Service via misaligned memory access.
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 confidenceAn integer overflow vulnerability exists in fast_ping.c in SmartDNS version Release46. The overflow leads to misaligned memory access, which remote attackers can exploit to cause a Denial of Service.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS 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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Verify SmartDNS installationCheck if the SmartDNS binary or service exists on the system. Common locations include /usr/sbin/smartdns, /usr/bin/smartdns, or check system services via 'systemctl list-unit-files | grep smartdns' or 'ps aux | grep smartdns'.Affected if SmartDNS is not installed or no smartdns process is running, then the environment is not affected.
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Determine installed SmartDNS versionRun 'smartdns -v' or 'smartdns --version' to retrieve the version number. Compare this version against Release46.Affected if The installed version is Release46 or earlier releases that contain the vulnerable fast_ping.c code.
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Identify fast_ping feature configurationExamine the SmartDNS configuration file (commonly /etc/smartdns.conf or /etc/smartdns/smartdns.conf) for any 'fast-ping' or 'ping' related directives. Also check for configuration files in the conf.d directory.Affected if The fast_ping feature or ping functionality is explicitly enabled in the configuration file.
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Check for exposed network listenerVerify if SmartDNS is bound to network interfaces accessible remotely. Use 'netstat -tulnp | grep smartdns' or 'ss -tulnp | grep smartdns' to identify listening ports and bind addresses.Affected if SmartDNS listens on external interfaces (0.0.0.0 or publicly routable IPs) rather than localhost only, increasing exposure to remote attackers.
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Review fast_ping.c presence in binaryIf the binary is available locally, use 'strings' or 'ldd' to inspect the compiled binary for references to 'fast_ping' functionality. Check the build configuration if source is available.Affected if The binary contains fast_ping code and the feature is compiled into the build.
A user is affected if SmartDNS Release46 is installed with fast_ping or ping functionality enabled and accessible to remote attackers.
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 SmartDNS to a patched version once released, or apply vendor-provided security patches. If immediate patching is not possible, consider network-level access controls or disabling the affected ping functionality.
- Consultation1.0 h
- Implementation3.0 h
- Testing2.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2024-42643 — 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-2024-42643 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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