CVE-2020-9499
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 · uneditedSome Dahua products have buffer overflow vulnerabilities. After the successful login of the legal account, the attacker sends a specific DDNS test command, which may cause the device to go down.
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 certain Dahua security products (cameras, NVRs) that allows authenticated attackers to cause device crash (DoS) by sending a specially crafted DDNS test command after valid login. The vulnerability requires prior authentication, indicating a boundary error in the DDNS command parsing routine.
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< 2019-12< 2019-12< 2019-12< 2019-12< 2019-12< 2019-12< 2019-12< 2019-12CVSS 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 modelAccess the device web interface or use ONVIF/manufacturer discovery tools to confirm the exact model number (e.g., SD6AL, SD5A, SD1A, PTZ1A, SD50, SD52C, IPC-HX5842H, IPC-HX7842H).Affected if The device is a Dahua camera or NVR matching one of the affected model families.
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Check the installed firmware versionLog into the device web interface and navigate to System > Version or System Info to view the firmware build date. Alternatively, use the manufacturer's SDK or SNMP to query the firmware version.Affected if The firmware build date is earlier than December 2019 (e.g., 2019-11 or older).
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Verify if DDNS service is enabledLog into the device and check Network > DDNS or similar menu to see if DDNS configuration is present or if the DDNS test feature is accessible.Affected if DDNS functionality is available and the device accepts DDNS configuration commands.
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Confirm network accessibility of management interfaceScan the network to determine if the device HTTP/HTTPS management ports (typically 80/443 or 37777) are reachable from untrusted networks.Affected if The management interface is exposed to networks outside trusted internal segments.
A user is affected if they have a Dahua device from the listed model families running firmware dated before December 2019 with DDNS functionality accessible over the network.
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 data2019-12
Restrict management interface exposure to trusted networks, enforce strong credentials, and apply vendor firmware updates when available. Network segmentation can limit exposure to authenticated attackers.
- 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-2020-9499 — 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-2020-9499 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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