CVE-2020-5129
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 in the SonicWall SMA1000 HTTP Extraweb server allows an unauthenticated remote attacker to cause HTTP server crash which leads to Denial of Service. This vulnerability affected SMA1000 Version 12.1.0-06411 and earlier.
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 denial-of-service vulnerability in the SonicWall SMA1000 HTTP Extraweb server allows unauthenticated remote attackers to crash the HTTP service by sending specially crafted requests. This affects versions 12.1.0-06411 and earlier.
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<= 12.1.0-06411CVSS 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.
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Check the SMA100 firmware versionAccess the SMA100 administrative interface or use the device's CLI command to display the current firmware version. This is typically found in the system status or firmware information section of the web UI, or via a command like 'show version' in the CLI.Affected if The installed firmware version is 12.1.0-06411 or any earlier version (any version <= 12.1.0-06411).
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Confirm the HTTP Extraweb service is enabledVerify in the SMA100 configuration that the HTTP Extraweb server feature is enabled. This is typically found under the SSL-VPN or web management settings in the administrative interface.Affected if The HTTP Extraweb server is enabled and accessible over the network, making the device vulnerable to remote exploitation.
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Check if the management interface is exposed to untrusted networksReview the network configuration to determine if the SMA100 web management interface (HTTP/HTTPS) is accessible from untrusted or external networks rather than being restricted to internal/trusted only.Affected if The HTTP Extraweb service is exposed to untrusted or external networks, allowing unauthenticated remote attackers to reach the vulnerable service.
You are affected if your SMA100 device runs firmware version 12.1.0-06411 or earlier AND has the HTTP Extraweb server enabled and accessible to potential attackers.
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 the available SonicWall firmware/software update for SMA1000 to a patched version beyond 12.1.0-06411. Organizations should verify their current version and schedule a maintenance window for the upgrade.
- Consultation3.0 h
- Implementation4.0 h
- Testing2.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2020-5129 — 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-2020-5129 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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