CVE-2026-51535
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 · uneditedIn OpENer 2.3.0 (commit 76b95cf), a resource exhaustion (Denial of Service) vulnerability exists in its network processing loop.
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 · low confidenceOpENer 2.3.0 contains a resource exhaustion vulnerability in its network processing loop that allows attackers to cause a Denial of Service by depleting system resources through malformed or excessive network requests.
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.
-
Confirm OpENer installationIdentify whether OpENer software is installed or running in your environment. Check for OpENer processes, services, or installed binaries.Affected if OpENer is not present in the environment, this CVE does not apply.
-
Check OpENer versionLocate and read the version information of the installed OpENer instance. Look in application metadata, binary properties, or version flags (such as --version or -v) if available.Affected if The installed version is exactly 2.3.0 - this is the only affected version listed in the CVE.
-
Verify network processing is enabledInspect OpENer configuration files, startup scripts, or runtime settings to determine if the network processing loop is active. Look for parameters related to network listeners, Ethernet/IP interfaces, or request handling modules.Affected if Network processing is disabled or not configured, the resource exhaustion flaw in the network loop cannot be triggered.
-
Assess network exposureDetermine if OpENer is bound to a network interface and accessible to external systems. Check firewall rules, binding addresses (e.g., 0.0.0.0 vs localhost), and whether the service is listening on standard industrial Ethernet ports.Affected if OpENer is only accessible locally with no external network exposure, the attack surface for sending malformed or excessive requests is minimal.
Your environment is affected if OpENer version 2.3.0 is installed with network processing enabled and exposed to network requests, allowing attackers to send malformed or excessive traffic to trigger resource exhaustion.
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 dataImplement resource limits (connection pools, request throttling, memory bounds) in the network processing loop and add timeouts for incomplete operations. Upgrade to any available patched version once released.
- 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-2026-51535 — 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-2026-51535 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
Be the first to add a field note for this CVE — a mitigation you’ve verified, a version caveat, or a link to a working fix. Sign in above to contribute.
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