Security readout for executives and security teams
Plain-English summary
Certain Ubiquiti EdgeRouters and UniFi Security Gateways can be exposed to remote code execution when older firmware is used with DHCPv6 prefix delegation enabled in stateful or stateless mode. The attacker must be directly connected to the WAN interface, so risk is highest at exposed network edges using IPv6 DHCPv6 delegation.
Executive priority
Prioritize remediation for sites using Ubiquiti routers or gateways at the WAN edge with IPv6 DHCPv6 delegation enabled. Treat as high urgency because impact is full device compromise, but scope should be validated against firmware version and DHCPv6 configuration before declaring enterprise-wide exposure.
Technical view
CVE-2023-23912 affects EdgeRouter 2.0.9-hotfix.5 and earlier and USG 4.4.56 and earlier when DHCPv6 prefix delegation is dhcpv6-stateless or dhcpv6-stateful. CVSS 3.1 is 8.8 with adjacent-network attack vector, no privileges, no user interaction, and high confidentiality, integrity, and availability impact. CWE mappings are CWE-75 and CWE-94.
Likely exposure
Organizations are likely exposed if they run affected Ubiquiti EdgeRouter or USG firmware at a WAN edge and have DHCPv6 prefix delegation set to dhcpv6-stateless or dhcpv6-stateful. Generic internet exposure alone is not enough based on the source; the attacker must be directly connected to the WAN interface.
Exploitation context
The source bundle does not show CISA KEV listing or cited evidence of active exploitation. The vulnerability is serious because successful exploitation can lead to code execution, but the documented attack path requires direct WAN-interface adjacency and a specific DHCPv6 prefix delegation configuration.
Researcher notes
The provided evidence supports affected version ranges, specific DHCPv6 prefix delegation modes, adjacent WAN-interface precondition, CVSS 8.8, and RCE impact. It does not provide exploit details, proof of exploitation, or deeper root-cause specifics beyond CWE-75 and CWE-94.
Mitigation direction
- Upgrade EdgeRouters to 2.0.9-hotfix.6 or later.
- Upgrade USG devices to 4.4.57 or later.
- Review vendor advisory for any model-specific operational guidance.
- Disable affected DHCPv6 prefix delegation modes if not required.
Validation and detection
- Inventory EdgeRouter and USG firmware versions.
- Check DHCPv6 prefix delegation configuration on WAN interfaces.
- Confirm EdgeRouters are 2.0.9-hotfix.6 or later.
- Confirm USG devices are 4.4.57 or later.
- Review edge sites where untrusted WAN adjacency is plausible.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-75: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCWE-94: Code execution behavior lookup
Code execution and unsafe deserialization weaknesses often justify reviewing execution behavior and process telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2023-23912 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 8.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H2.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.8HighVector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source materials
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Failure to Sanitize Special Elements into a Different Plane (Special Element Injection)
Failure to Sanitize Special Elements into a Different Plane (Special Element Injection) represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.
Improper Control of Generation of Code ('Code Injection')
Improper Control of Generation of Code ('Code Injection') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.