CVE-2020-1876
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 · uneditedNIP6800;Secospace USG6600;USG9500 with versions of V500R001C30; V500R001C60SPC500; V500R005C00SPC100 have an out-of-bounds write vulnerability. An unauthenticated attacker crafts malformed packets with specific parameter and sends the packets to the affected products. Due to insufficient validation of packets, which may be exploited to cause the process reboot.
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 confidenceOut-of-bounds write vulnerability in Huawei NIP6800, Secospace USG6600, and USG9500 firewall products. An unauthenticated attacker can send malformed packets with specific parameters that bypass input validation, causing memory corruption beyond allocated buffer boundaries. This leads to process reboot and denial of service.
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= v500r001c30= v500r001c60spc500= v500r005c00= v500r001c30spc600= v500r001c60spc500= v500r005c00= v500r001c30spc200= v500r001c30spc600= v500r001c60spc500= v500r005c00CVSS 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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Identify the device modelLog into the firewall CLI or web interface and run 'display device' or 'display version' to confirm the model is NIP6800, USG6600, or USG9500Affected if Model is Huawei NIP6800, Secospace USG6600, or USG9500
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Determine the firmware versionRun 'display version' or check the firmware file name. Look for version strings: V500R001C30, V500R001C30SPC200, V500R001C30SPC600, V500R001C60SPC500, V500R005C00, or V500R005C00SPC100Affected if Installed version matches one of the affected versions listed in the CVE (exact match required)
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Confirm management interface is network-accessibleCheck if the firewall's management interface or external interfaces are reachable from untrusted networks. Run 'display ip interface' or review interface configurationsAffected if The device accepts network packets from unauthenticated sources on any accessible interface
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Check for recent process crashesRun 'display logbuffer' or 'display crashlog' and look for unexpected process restarts, particularly around the time of suspicious network activityAffected if Processes are rebooting unexpectedly without administrative cause
You are affected if your Huawei NIP6800, USG6600, or USG9500 firewall is running one of the specific firmware versions listed (V500R001C30, V500R001C60SPC500, V500R005C00, or their SPC variants) and is network-accessible to unauthenticated 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 vendor-supplied patches for the affected versions (V500R001C30, V500R001C60SPC500, V500R005C00SPC100) or upgrade to a fixed release. If patching is not immediately possible, restrict network access to the management interface and filter malicious packet patterns at upstream devices.
- Consultation4.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2020-1876 — 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-2020-1876 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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