CVE-2020-15490
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 · uneditedAn issue was discovered on Wavlink WL-WN530HG4 M30HG4.V5030.191116 devices. Multiple buffer overflow vulnerabilities exist in CGI scripts, leading to remote code execution with root privileges. (The set of affected scripts is similar to CVE-2020-12266.)
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 confidenceMultiple buffer overflow vulnerabilities in CGI scripts on Wavlink WL-WN530HG4 devices (firmware M30HG4.V5030.191116) allow remote attackers to achieve remote code execution with root privileges. The affected CGI scripts (similar to CVE-2020-12266) fail to properly validate input bounds before copying data into fixed-size buffers.
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= m30hg4.v5030.191116CVSS 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
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/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 device modelLocate the device model number on the physical device label or check the admin interface for the hardware version. Confirm it is a Wavlink WL-WN530HG4 router.Affected if The device model is not WL-WN530HG4, then the CVE does not apply.
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Check firmware versionAccess the router admin interface (typically via web browser at the device's IP address) and navigate to the Status or System Information page to view the firmware version. Alternatively, check the version displayed on the device label or in backup configuration files.Affected if The firmware version is M30HG4.V5030.191116 exactly, indicating this specific vulnerable version is installed.
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Verify remote admin access is enabledIn the router admin interface, check the WAN or Remote Management settings to see if remote administration (web-based access from the internet) is enabled. Look for options like Enable Remote Management, Allow Remote Access, or similar.Affected if Remote administration is enabled and the CGI scripts are accessible from the WAN side, the device is exposed to remote exploitation.
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Confirm CGI endpoints are reachableAttempt to access common CGI script paths on the device from the WAN interface if remote access is enabled, or test internally by accessing URLs such as /cgi-bin/ or specific script names known on this device. This confirms the attack surface exists.Affected if CGI scripts are reachable from the network and the firmware version matches, the device is vulnerable to buffer overflow exploitation.
A user is affected if they are running the exact firmware version M30HG4.V5030.191116 on a WL-WN530HG4 device and have remote CGI script access enabled or the device is otherwise 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 dataApply vendor firmware patches when available; if no patch exists, disable remote administration interfaces, segment the device network, and consider device replacement. Network-level filtering to restrict access to CGI endpoints can serve as an interim compensating control.
- Consultation4.0 h
- Implementation8.0 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-2020-15490 — 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-2020-15490 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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