CVE-2026-7503
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 · uneditedA vulnerability was detected in code-projects for Plugin 4.1.2cu.5137. The impacted element is the function setWiFiMultipleConfig in the library /lib/cste_modules/wireless.so of the file /cgi-bin/cstecgi.cgi. The manipulation of the argument wepkey2 results in buffer overflow. The attack can be launched remotely. The exploit is now public and may be used.
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 confidenceBuffer overflow vulnerability in the setWiFiMultipleConfig function of the wireless.so library within the cstecgi.cgi CGI binary. The wepkey2 argument is not properly bounds-checked before being used, allowing remote attackers to potentially execute arbitrary code or cause denial of service.
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
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:L/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 the cstecgi.cgi binarySearch for the cstecgi.cgi file on the device filesystem, typically found in /cgi-bin/ or /www/cgi-bin/ directoriesAffected if The binary exists and is a CSTec CGI interface component (common in rural router firmware)
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Identify the wireless.so libraryLocate the wireless.so shared library file that contains the setWiFiMultipleConfig function, typically in /lib/ or /usr/lib/ directoriesAffected if The wireless.so library is present and includes the setWiFiMultipleConfig function
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Verify WEP authentication is enabledCheck the device wireless configuration for WEP encryption settings; look for wepkey2 parameter in wireless configuration files or via the CGI interface query parametersAffected if WEP encryption is enabled and the wepkey2 argument is being processed by the setWiFiMultipleConfig function
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Confirm the wepkey2 parameter is acceptedInspect HTTP requests to the cstecgi.cgi endpoint for the wepkey2 parameter being passed, or review any intercepted/processed configuration payloadsAffected if The wepkey2 parameter is accepted by the CGI without proper bounds validation
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Check device firmware versionRetrieve the device firmware version from system information pages or via SNMP/mIB queries, then compare against any known patched versions if availableAffected if The firmware version predates any vendor security update addressing this overflow
The environment is affected if the device runs a firmware containing the vulnerable cstecgi.cgi with wireless.so that processes wepkey2 while WEP authentication is enabled.
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 vendor firmware update when available; until then, restrict network access to the CGI interface and monitor for exploitation attempts. Consider disabling WEP authentication if possible as a temporary workaround.
- Consultation3.0 h
- Implementation8.0 h
- Testing4.0 h
- Review / QA3.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-7503 — 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-2026-7503 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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- Version or environment caveats, and links to real fixes
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