CVE-2015-7937
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 · uneditedStack-based buffer overflow in the GoAhead Web Server on Schneider Electric Modicon M340 PLC BMXNOx and BMXPx devices allows remote attackers to execute arbitrary code via a long password in HTTP Basic Authentication 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 · high confidenceA stack-based buffer overflow vulnerability exists in the GoAhead Web Server running on Schneider Electric Modicon M340 PLCs (BMXNOx and BMXPx models). The vulnerability is triggered by sending an excessively long password within HTTP Basic Authentication headers, allowing remote attackers to overflow a stack buffer and execute arbitrary code with the privileges of the web server.
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 dataall versionsall versionsall versionsall versionsall versionsall versionsall versionsall versionsCVSS 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
- Authentication
- None
- Confidentiality
- Complete
- Integrity
- Complete
- Availability
- Complete
AV:N/AC:L/Au:N/C:C/I:C/A:C
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 the PLC model numberLocate the Schneider Electric PLC model identification label on the physical hardware or query the PLC runtime for its model designation (BMXNOx or BMXPx family)Affected if The model is one of: Bmxnoc0401, Bmxnoe0100, Bmxnoe0100h, Bmxnoe0110, Bmxnoe0110h, Bmxnor0200, Bmxnor0200h, or Bmxpra0100
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Verify the GoAhead Web Server is enabledCheck the PLC configuration or web server settings to determine if the GoAhead HTTP service is running and listening on the networkAffected if The GoAhead web server is enabled and actively listening for HTTP connections on the PLC
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Confirm HTTP Basic Authentication is configuredExamine the web server authentication configuration to verify that Basic Authentication is the selected or default authentication methodAffected if HTTP Basic Authentication is enabled as the authentication mechanism for the web interface
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Check network accessibility of the web interfaceProbe the PLC IP address on port 80/443 or the configured HTTP port to confirm the web server is network-accessibleAffected if The PLC web interface is reachable from any network segment beyond the isolated control system network
If the PLC is a Modicon M340 model (BMXNOx or BMXPx family) with the GoAhead web server enabled and HTTP Basic Authentication configured, and the web interface is network-accessible, the environment is vulnerable to CVE-2015-7937.
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 dataApply available firmware updates from Schneider Electric. If no patch is available, restrict network access to the PLC's web interface using firewalls or network segmentation, and consider disabling the web server if not operationally required.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA2.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2015-7937 — 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-2015-7937 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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- 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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