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Web P2pApplication · Dahuasecurity

CVE-2020-9501

MEDIUM · 5.5 CVSS v3.1 Published 2020-05-13
Fix available
A fix is available. Upgrade to 2020-04 or later.
See remediation →
57/100
Remediation priority · Elevated
Zero-click

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 · unedited
Attackers can obtain Cloud Key information from the Dahua Web P2P control in specific ways. Cloud Key is used to authenticate the connection between the client tool and the platform. An attacker may use the leaked Cloud Key to impersonate the client to connect to the platform, resulting in additional consumption of platform server resources. Versions with Build time before April 2020 are affected.

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 confidence

The Dahua Web P2P control improperly exposes Cloud Key authentication credentials, allowing remote attackers to obtain these keys through specific manipulation. The leaked Cloud Key enables attackers to impersonate legitimate clients and connect to the platform, causing unauthorized consumption of server resources.

MitigationUpgrade Dahua device firmware to versions with Build time after April 2020. Additionally, monitor for unauthorized P2P connections and implement network segmentation to limit exposure of management interfaces.

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
Web P2pApplication
Affected:< 2020-04

CVSS 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
Local
Complexity
Low
Privileges
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

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 checks

Work through these to decide whether this CVE applies to you.

  1. Identify Dahua device firmware version
    Access the device web interface or use the ONVIF/SNMP protocol to query the firmware version. Common paths: Device Info > Version, or via SSH run 'grep build /mnt/mtd/ver.txt' or similar version file.
    Affected if Firmware build date is before April 2020 (versions prior to the 2020-04 release)
  2. Confirm Web P2P service is enabled
    Check device network settings for P2P/Cloud configuration. In web UI: Network > P2P or Platform > P2P. Look for status showing 'Enable' or 'Online'. CLI: check for p2p process running via 'ps | grep p2p'.
    Affected if P2P/Cloud connection is enabled and the device is exposed to internet or untrusted networks
  3. Verify P2P port exposure
    Check router/firewall port forwarding rules and device network configuration. P2P typically uses ports 37777, 8000, or custom ports. Scan external interfaces: 'nmap -p 37777,8000 <external-ip>'.
    Affected if Device management ports (especially P2P ports) are directly exposed to the internet without firewall filtering
  4. Review P2P connection logs for unauthorized access
    Access device logs via: Web UI > Log Search > P2P/Network logs, or via API: 'http://<device-ip>/cgi-bin/log.cgi?type=P2P'. Look for connection attempts from unfamiliar client IDs or IP addresses.
    Affected if Logs show connections from unknown client IDs or multiple simultaneous P2P connections from suspicious sources
  5. Check Cloud Key configuration exposure
    Inspect the device configuration file for cloud-related parameters. Via API: 'http://<device-ip>/cgi-bin/config.cgi?action=get&channel=0' and look for 'cloud' or 'p2p' sections. Check if credentials are transmitted unencrypted.
    Affected if P2P configuration contains active Cloud Keys and device accepts connections without additional authentication verification

The environment is affected if the Dahua device runs firmware with build date prior to April 2020 AND has Web P2P service enabled, particularly if the management interface is internet-exposed.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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 data
Upgrade available Upgrade to 2020-04 or later
Fixed in 2020-04
Interim mitigation

Upgrade Dahua device firmware to versions with Build time after April 2020. Additionally, monitor for unauthorized P2P connections and implement network segmentation to limit exposure of management interfaces.

Fix this in Web P2p Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing4.0 h
  • Review / QA2.0 h
18.0 hours of engineering $3,200
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2020-9501 in production — separate from our analysis above.

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • 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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