CVE-2020-8145
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 · uneditedThe UniFi Video Server (Windows) web interface configuration restore functionality at the “backup” and “wizard” endpoints does not implement sufficient privilege checks. Low privileged users, belonging to the PUBLIC_GROUP or CUSTOM_GROUP groups, can access these endpoints and overwrite the current application configuration. This can be abused for various purposes, including adding new administrative users. Affected Products: UniFi Video Controller v3.9.3 (for Windows 7/8/10 x64) and prior. Fixed in UniFi Video Controller v3.9.6 and newer.
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 confidenceThe UniFi Video Server (Windows) web interface contains insufficient authorization checks at the backup and wizard endpoints used for configuration restore. Users with low privileges assigned to PUBLIC_GROUP or CUSTOM_GROUP can directly access these endpoints and overwrite the application configuration, enabling them to add new administrative users and gain full system access.
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<= 3.9.3CVSS 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
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- High
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/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 checksWork through these to decide whether this CVE applies to you.
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Check installed UniFi Video versionOpen the UniFi Video Controller web interface and navigate to Settings > System, or check the Windows Programs and Features list for 'UniFi Video' version. Alternatively, check the install directory for a version file.Affected if The installed version is 3.9.3 or lower (any version <= 3.9.3)
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Confirm web interface is accessibleVerify the UniFi Video web interface (default ports 7080, 7443 or 80/443 if configured) is reachable on the network.Affected if The web interface is exposed and reachable
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Identify user group assignmentsLog into the UniFi Video web interface as an administrator and navigate to Users or Groups management. Review all user accounts and note their assigned group membership, specifically looking for PUBLIC_GROUP or CUSTOM_GROUP assignments.Affected if Any user account is assigned to PUBLIC_GROUP or CUSTOM_GROUP (low-privilege groups)
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Test backup endpoint accessUsing a low-privilege user account (assigned to PUBLIC_GROUP or CUSTOM_GROUP), attempt to access the backup/restore endpoint directly via browser or curl: http(s)://<server>:<port>/api/backup or similar configuration restore URLs.Affected if A low-privilege user can access and trigger configuration restore functions without admin authentication
If the UniFi Video version is 3.9.3 or lower AND low-privilege users exist in PUBLIC_GROUP or CUSTOM_GROUP, the environment is affected by this authorization bypass vulnerability.
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 dataUpgrade UniFi Video Controller to version 3.9.6 or newer. Additionally, audit and restrict user group assignments to ensure low-privileged users cannot access sensitive configuration endpoints.
- Consultation3.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA2.0 h
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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 sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2020-8145 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
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- Version or environment caveats, and links to real fixes
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