CVE-2020-9502
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 with Build time before December 2019 have Session ID predictable vulnerabilities. During normal user access, an attacker can use the predicted Session ID to construct a data packet to attack the device.
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 confidenceDahua devices built before December 2019 contain a session ID prediction vulnerability where session IDs can be guessed or calculated by attackers, allowing them to hijack legitimate user sessions or send malicious packets using the predictable session identifier.
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
- 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 the Dahua device modelLocate the device label on the hardware or access the device web interface to view the model name (e.g.,Sd6al, Sd5a, Sd1a, Ptz1a, Sd52c, Ipc Hx5842h, Ipc Hx7842h)Affected if The device model matches one of the affected product lines: Sd6al, Sd5a, Sd1a, Ptz1a, Sd52c, Ipc Hx5842h, Ipc Hx7842h, orSd50
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Retrieve the firmware versionLog in to the device web interface and navigate to the System or About section to view the firmware version, or use the Dahua Config Tool or ONVIF discovery to query the firmware versionAffected if A firmware version is retrieved for confirmation
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Determine firmware build dateCheck the firmware version string or build date displayed in the device information page; if only a version number is shown, compare it against the affected range or contact Dahua support to confirm the build dateAffected if The firmware build date is before December 2019 (e.g., version shows a date earlier than 2019-12 or falls within the affected version range for your model)
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Assess network exposure of management interfaceReview firewall rules and network configuration to determine if the device HTTP port (typically 80/443) or RTSP port is accessible from untrusted networks or the internetAffected if The management web interface is exposed to untrusted networks, increasing the likelihood of exploitation
You are affected if your Dahua device matches one of the listed models and runs firmware built before December 2019, especially if the management interface is accessible from untrusted networks.
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.
dbcve · scoped2019-12
Update affected Dahua devices to firmware versions built after December 2019, or contact Dahua for specific patches; restrict network access to management interfaces where possible.
Firmware with Build time December 2019 or later (specific version per device model from Dahua's official download page)
- 1. Identify the exact Dahua device model number from the affected product list (Sd6al, Sd5a, Sd1a, Ptz1a, Sd50, Sd52c, Ipc Hx5842h, or Ipc Hx7842h)
- 2. Access the device's web-based management interface or use Dahua's ConfigTool or SmartPSS utility
- 3. Navigate to the Maintenance or System settings section
- 4. Locate the firmware upgrade option
- 5. Download the firmware update from Dahua's official support website (www.dahuasecurity.com) - ensure the firmware build date is December 2019 or later
- 6. Upload the firmware file to the device and initiate the upgrade
- 7. Wait for the upgrade to complete - do not power off the device during this process
- 8. After reboot, verify the new firmware version/build date in the device information section
Generated from the published advisory — verify against the referenced sources before acting.
- 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-2020-9502 — 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-2020-9502 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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