CVE-2020-1816
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 · uneditedHuawei NIP6800 versions V500R001C30, V500R001C60SPC500, and V500R005C00; Secospace USG6600 and USG9500 versions V500R001C30SPC200, V500R001C30SPC600, V500R001C60SPC500, and V500R005C00 have a Denial of Service (DoS) vulnerability. Due to improper processing of specific IPSEC packets, remote attackers can send constructed IPSEC packets to affected devices to exploit this vulnerability. Successful exploit could cause the IPSec function of the affected device abnormal.
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 confidenceHuawei NIP6800 and USG6600/USG9500 firewall appliances contain a DoS vulnerability in IPSec packet processing. Remote attackers can send specially crafted IPSEC packets to cause the IPSec function to become abnormal, resulting in 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= v500r001c30spc200= 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 firewall modelRun 'display device' or check the physical device label to confirm the model is NIP6800, USG6600, or USG9500Affected if Model is not one of these three, the device is not affected
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Check the firmware versionRun 'display version' on the device console to retrieve the current firmware versionAffected if Version matches one of the affected versions: v500r001c30, v500r001c30spc200, v500r001c30spc600, v500r001c60spc500, or v500r005c00
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Verify IPSec is enabledRun 'display ipsec sa' or 'display ipsec proposal' to check if any IPSec security associations or proposals are configuredAffected if No IPSec SAs or proposals exist, the vulnerability cannot be triggered
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Check for active IPSec trafficRun 'display ipsec statistics' to see if there are incoming IPSec packets being processedAffected if No inbound IPSec traffic is observed, the device is not currently being exploited but remains vulnerable if IPSec is enabled on an affected version
Device is affected if it is a NIP6800, USG6600, or USG9500 running one of the listed firmware versions AND IPSec is enabled.
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 or upgrade to fixed versions when available. Until then, restrict IPSec traffic to trusted sources using access control lists or firewall rules.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA4.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $6,176.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2020-1816 — 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-2020-1816 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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