CVE-2023-41251
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 stack-based buffer overflow vulnerability exists in the boa formRoute functionality of Realtek rtl819x Jungle SDK v3.4.11. A specially crafted series of HTTP requests can lead to remote code execution. An attacker can send an HTTP request to trigger this 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 · high confidenceA stack-based buffer overflow exists in the boa web server's formRoute functionality within Realtek rtl819x Jungle SDK v3.4.11. The vulnerability allows remote attackers to overwrite stack memory and achieve arbitrary code execution through specially crafted HTTP requests targeting the formRoute handler.
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= 3.4.11= rer4_a_v3411b_2t2r_lev_09_170623CVSS 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
- High
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:H/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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Identify the device modelDetermine if the target device is a Level1 WBR-6013 router or a device based on the Realtek rtl819x Jungle SDKAffected if The device is a Level1 WBR-6013 or uses Realtek rtl819x Jungle SDK
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Check the firmware versionRetrieve the firmware version from the device or SDK. For Level1 WBR-6013, check if the version matches rer4_a_v3411b_2t2r_lev_09_170623 or is earlier. For SDK-based devices, identify the SDK version string.Affected if Firmware version equals 3.4.11 (SDK) or rer4_a_v3411b_2t2r_lev_09_170623 (Level1 WBR-6013)
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Verify the boa web server is runningCheck if the boa web server process is running on the device, typically on ports 80 or 443. Use commands like 'ps' or check open network ports.Affected if The boa web server is active and accessible on the network
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Confirm formRoute HTTP handler existsAttempt to access the formRoute handler via HTTP request, such as a GET or POST to a URL containing 'formRoute' parameter, or examine the boa configuration for route definitions.Affected if The formRoute handler is registered and accessible as an HTTP endpoint
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Check if the web interface is exposedVerify that the boa web server management interface is reachable from the network (not localhost-only). Inspect firewall rules or network access controls.Affected if The web management interface is network-accessible (not limited to localhost)
The environment is affected if the device is a Level1 WBR-6013 with firmware rer4_a_v3411b_2t2r_lev_09_170623, or uses Realtek rtl819x Jungle SDK version 3.4.11, and the boa web server with formRoute handler is running and network-accessible.
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 dataUpdate to a patched version of the Realtek rtl819x SDK if available; otherwise, implement proper bounds checking and input validation on the formRoute HTTP parameter handler to prevent stack buffer overflows, or apply compiler-based stack canaries and DEP/NX protections.
- Consultation6.0 h
- Implementation12.0 h
- Testing6.0 h
- Review / QA3.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2023-41251 — 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-2023-41251 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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