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OpenerApplication · Opener Project

CVE-2021-27482

HIGH · 7.5 CVSS v3.1 Published 2022-05-12
Fix available
A fix is available. Upgrade to after 2.3 or later.
See remediation →
84/100
Remediation priority · High
Remotely reachable No privileges Zero-click

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 · unedited
A specifically crafted packet sent by an attacker to EIPStackGroup OpENer EtherNet/IP commits and versions prior to Feb 10, 2021 may allow the attacker to read arbitrary data.

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 confidence

A specifically crafted EtherNet/IP packet sent to vulnerable versions of EIPStackGroup OpENer (prior to Feb 10, 2021) allows remote attackers to read arbitrary memory data due to improper input validation in packet processing, resulting in sensitive information disclosure.

MitigationUpdate to OpENer versions released on or after February 10, 2021 which contain the vendor patch, or apply available security updates to address the improper input validation vulnerability.

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
OpenerApplication
Affected:<= 2.3

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
High
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

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 checks

Work through these to decide whether this CVE applies to you.

  1. Identify OpENer version
    Locate the OpENer installation directory and check for version information in source files, build artifacts, or version metadata files. Look for a 'VERSION', 'version.h', or similar file that displays the OpENer version number.
    Affected if The installed version is 2.3 or lower, or was built prior to February 10, 2021.
  2. Confirm EtherNet/IP service is active
    Check if the OpENer service or process is running and listening on EtherNet/IP ports (typically UDP/44818 for EtherNet/IP). Use netstat or similar tools to enumerate open ports associated with the OpENer application.
    Affected if The EtherNet/IP listener is enabled and accessible on the network, as the vulnerability is triggered by receiving crafted packets.
  3. Review packet processing logs
    Examine OpENer application logs for any anomalies related to packet handling, memory access errors, or unexpected behavior during EtherNet/IP communication. Look for crash dumps or error messages mentioning memory reads.
    Affected if Logs show abnormal memory access patterns or the service has crashed unexpectedly during packet processing.

A system is affected if OpENer version 2.3 or earlier is installed and the EtherNet/IP stack is actively listening for incoming packets.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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 · scoped
Upgrade available Upgrade to a release after 2.3
Interim mitigation

Update to OpENer versions released on or after February 10, 2021 which contain the vendor patch, or apply available security updates to address the improper input validation vulnerability.

Recommended fix Moderate confidence

Any version released after February 10, 2021 (or version 2.4 or later if available)

  1. 1. Identify the current version of EIPStackGroup OpENer being used by checking the project files or build configuration
  2. 2. If the current version is 2.3 or earlier, or if the build date is prior to February 10, 2021, plan for an upgrade
  3. 3. Obtain the latest version of OpENer from the official EIPStackGroup repository (github.com/EIPStackGroup/OpENer)
  4. 4. Review the release notes or commit history to confirm the security fix for CVE-2021-27482 is included
  5. 5. Test the new version in a staging environment before deploying to production
  6. 6. Deploy the upgraded version to replace the vulnerable installation
Caveat Review release notes for any API changes or compatibility considerations before upgrading

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Opener Scoped from the published advisory
  • Consultation2.0 h
  • Implementation6.0 h
  • Testing4.0 h
  • Review / QA2.0 h
14.0 hours of engineering $2,440
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,904.

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2021-27482 in production — separate from our analysis above.

No notes yet

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What this is

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.

What belongs here
  • 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