CVE-2021-38427
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 · uneditedRTI Connext DDS Professional and Connext DDS Secure Versions 4.2.x to 6.1.0 are vulnerable to a stack-based buffer overflow, which may allow a local attacker to execute arbitrary code.
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 confidenceRTI Connext DDS Professional and Connext DDS Secure versions 4.2.x through 6.1.0 contain a stack-based buffer overflow vulnerability that could allow a local attacker to execute arbitrary code via overflow of a stack-allocated buffer.
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>= 4.2.0, <= 6.1.0>= 4.2.0, <= 6.1.0CVSS 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
- Local
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:L/AC:L/PR:L/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 RTI Connext DDS installationLocate RTI Connext DDS installation directories or check installed software on the system. Common locations include /opt/rti or C:\rti on Windows. Look for directories named 'rti_connext_dds' or similar RTI software artifacts.Affected if RTI Connext DDS Professional or Connext DDS Secure is installed on the system
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Determine installed versionCheck the version of the installed RTI Connext DDS software. This is typically found in version files, About dialogs, or by running version-checking scripts included with the installation. Common file names include version.txt, about.html, or rti_version.h.Affected if The installed version cannot be determined or is 6.1.0 or lower
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Compare version against affected rangeReview the installed version number. Affected versions are from 4.2.0 up to and including 6.1.0.Affected if The installed version is >= 4.2.0 AND <= 6.1.0 (this includes 4.2.0, 5.x.x, and 6.1.0)
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Confirm product variantVerify whether the installed product is RTI Connext Professional or Connext Secure, as both variants are affected.Affected if The product is RTI Connext DDS Professional or Connext DDS Secure within the affected version range
The system is affected if RTI Connext DDS Professional or Connext DDS Secure is installed with a version between 4.2.0 and 6.1.0 inclusive.
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 dataUpgrade to a patched version of RTI Connext DDS (6.1.0 or later) that addresses the stack-based buffer overflow vulnerability. For systems where immediate upgrading is not feasible, restrict local access to trusted users and monitor for suspicious activity.
- Consultation4.0 h
- Implementation8.0 h
- Testing12.0 h
- Review / QA4.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-38427 — 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-2021-38427 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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A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- 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
- No spam, self-promotion, credentials, or personal data