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Usg FirmwareOperating system · Ui

CVE-2023-23912

HIGH · 8.8 CVSS v3.1 Published 2023-02-09
Fix available
A fix is available. Upgrade to 2.0.9 / 4.4.57 or later.
See remediation →
93/100
Remediation priority · Urgent
Public exploit No privileges Zero-click Patch available

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
A vulnerability, found in EdgeRouters Version 2.0.9-hotfix.5 and earlier and UniFi Security Gateways (USG) Version 4.4.56 and earlier with their DHCPv6 prefix delegation set to dhcpv6-stateless or dhcpv6-stateful, allows a malicious actor directly connected to the WAN interface of an affected device to create a remote code execution vulnerability.

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

A detailed technical summary for this CVE is being prepared.

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
Usg FirmwareOperating system
Affected:< 4.4.57
Usg Pro 4 FirmwareOperating system
Affected:< 4.4.57
Er 10x FirmwareOperating system
Affected:< 2.0.9= 2.0.9
Er 12 FirmwareOperating system
Affected:< 2.0.9= 2.0.9
Er 12p FirmwareOperating system
Affected:< 2.0.9= 2.0.9
Er 4 FirmwareOperating system
Affected:< 2.0.9= 2.0.9
Er 6p FirmwareOperating system
Affected:< 2.0.9= 2.0.9
Er 8 Xg FirmwareOperating system
Affected:< 2.0.9= 2.0.9

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

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

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.

dbcve · scoped
Upgrade available Upgrade to 2.0.9 / 4.4.57 or later
Fixed in 2.0.94.4.57
Vendor patch community.ui.com →
Recommended fix High confidence

USG/USG Pro 4: firmware 4.4.57 | EdgeRouter models: firmware 2.0.9

  1. Download the firmware update from the official UniFi community release page at https://community.ui.com/releases/Security-Advisory-Bulletin-028-028/696e4e3b-718c-4da4-9a21-965a85633b5f
  2. For UniFi Security Gateway (USG/USG Pro 4), upgrade to firmware version 4.4.57 or later
  3. For EdgeRouter models (ER-4, ER-6P, ER-8, ER-10X, ER-12, ER-12P), upgrade to firmware version 2.0.9 or later
  4. After upgrading, verify the DHCPv6 prefix delegation settings in the web UI under the WAN interface configuration to confirm the fix is applied
  5. If upgrading is not immediately possible, disable DHCPv6 prefix delegation (dhcpv6-stateless and dhcpv6-stateful modes) on the WAN interface as a temporary mitigation until the firmware update can be applied
Caveat Review release notes for any configuration changes or known issues before upgrading; ensure you have a backup of the current configuration

Generated from the published advisory — verify against the referenced sources before acting.

We can perform the upgrade in your staging environment and verify nothing breaks — typical engagement from $1,950. Get the upgrade done

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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-2023-23912 in production — separate from our analysis above.

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What this is

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What belongs here
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  • Version or environment caveats, and links to real fixes
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