CVE-2021-27480
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 · uneditedDelta Industrial Automation COMMGR Versions 1.12 and prior are vulnerable to a stack-based buffer overflow, which may allow an attacker to execute remote 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 · moderate confidenceDelta Industrial Automation COMMGR versions 1.12 and prior contain a stack-based buffer overflow vulnerability. This memory corruption flaw occurs when the application writes data beyond the allocated buffer boundaries on the stack, potentially allowing an attacker to overwrite return addresses or adjacent memory to achieve remote code execution.
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<= 1.12CVSS 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
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/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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Locate COMMGR installationSearch for Delta Industrial Automation COMMGR software on the system using standard software inventory tools or by looking for COMMGR-related processes, services, or installed programsAffected if COMMGR is found to be installed on the system
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Identify installed COMMGR versionUse the system's software inventory, installed programs list, or check the COMMGR application directly for its version information (commonly accessible via the application, its executable properties, or the Windows Add/Remove Programs list)Affected if The exact version number cannot be determined or is found to be at or below 1.12
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Compare version to affected rangeReview the identified version against the affected range: versions 1.12 and prior are vulnerable to the stack-based buffer overflowAffected if The installed version is 1.12 or any version lower than 1.12
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Verify service exposureCheck if the COMMGR service is running and accessible on the network, as the buffer overflow could potentially allow remote code execution if exposed to untrusted networksAffected if COMMGR is running and network-accessible to untrusted entities
A system is affected if Delta Industrial Automation COMMGR version 1.12 or any prior version is installed and running, particularly if the service is network-accessible.
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 COMMGR to a version beyond 1.12 if available; otherwise, isolate the affected system from untrusted networks and monitor for exploitation attempts given the critical CVSS score and remote code execution potential.
- Consultation8.0 h
- Implementation12.0 h
- Testing16.0 h
- Review / QA8.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-27480 — 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-2021-27480 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
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