CVE-2026-3631
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 Electronics COMMGR2 has Buffer Over-read DoS vulnerability.
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 over-read vulnerability in Delta Electronics COMMGR2 allows an attacker to read memory beyond allocated buffer boundaries, potentially causing the service to crash or become unresponsive, resulting in a Denial of Service.
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< 2.11.1CVSS 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 COMMGR2 installationSearch for COMMGR2 or Delta Communications Manager on the system using installed programs list, services panel, or file system search for 'commgr' executable filesAffected if COMMGR2 software is found installed on the system
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Determine installed versionLocate the COMMGR2 executable or application and check its version property, or use system inventory tools that report installed software versionsAffected if The installed version is lower than 2.11.1 (e.g., 2.10.x, 2.9.x, etc.)
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Confirm service statusCheck if the COMMGR2 service or daemon is currently running using task manager, service console, or process listing commandsAffected if The COMMGR2 service is actively running and processing network communications
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Assess network exposureReview firewall rules and network configuration to determine if COMMGR2 network ports are accessible from untrusted networksAffected if COMMGR2 service ports are exposed to untrusted or public network segments
The system is affected if COMMGR2 is installed with a version lower than 2.11.1 and the service is running and accessible on the network.
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 · scoped2.11.1
Since no specific patch or version information is provided, organizations should restrict network access to affected COMMGR2 installations to untrusted parties and monitor Delta Electronics for security updates.
Commgr2 version 2.11.1 or later
- 1. Identify all instances of Delta Electronics COMMGR2 software in your environment
- 2. Check the current installed version of COMMGR2 on each system
- 3. If the installed version is below 2.11.1, download the updated version from the official Delta Electronics support portal at filecenter.deltaww.com
- 4. Test the new version in a non-production environment first
- 5. Schedule a maintenance window for the upgrade
- 6. Back up current configurations before upgrading
- 7. Install COMMGR2 version 2.11.1 or later
- 8. Verify the installation was successful and the version is correct
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation4.0 h
- Implementation8.0 h
- Testing4.0 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 $5,120.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-3631 — 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-2026-3631 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