CVE-2020-6863
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 · uneditedZTE E8820V3 router product is impacted by a permission and access control vulnerability. Attackers could use this vulnerability to tamper with DDNS parameters and send DoS attacks on the specified URL.
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 confidenceThe ZTE E8820V3 router contains a permission and access control vulnerability that allows unauthenticated or unauthorized attackers to tamper with DDNS (Dynamic DNS) configuration parameters. This flaw enables attackers to modify DDNS settings and leverage the router to launch DoS attacks against specified URLs.
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< 3.1.0.1000.5CVSS 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
- Adjacent
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:A/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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Identify the router firmware versionAccess the router's web administration interface and navigate to the Status or System Information page to view the firmware version. Alternatively, check the version displayed on the device label or use the router's CLI if accessible (such as via telnet or SSH).Affected if The firmware version is lower than 3.1.0.1000.5 (for example, 3.0.x or earlier releases).
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Verify if DDNS feature is configuredLog into the router's web interface and locate the DDNS (Dynamic DNS) settings section, typically found under Network Settings or Advanced settings. Check whether any DDNS provider is enabled and configured.Affected if DDNS is enabled and a provider is configured on the device.
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Check for unauthorized DDNS configuration changesReview the current DDNS settings for any unknown or suspicious DDNS providers, hostnames, or target URLs that were not configured by you. Compare against known-good configurations if previously documented.Affected if The DDNS configuration contains unexpected hostnames, providers, or target URLs that you did not configure.
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Inspect router for unexpected DDNS-related network trafficUse packet capture (tcpdump or similar) on the router's WAN interface or monitor logs to identify outbound connections to unfamiliar DDNS provider endpoints or unusual HTTP/HTTPS requests to external targets.Affected if The router is making outbound connections to DDNS providers or URLs that were not explicitly configured by the administrator.
You are affected if the ZTE E8820V3 router is running firmware version below 3.1.0.1000.5 AND has DDNS functionality enabled or configured.
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 data3.1.0.1000.5
Apply vendor firmware updates if available; restrict access to the router's management interface to trusted networks only; disable unused remote management features; monitor for unauthorized configuration changes.
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA1.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2020-6863 — 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-2020-6863 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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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.
- 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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