CVE-2023-23912

CVE-2023-23912 is a high-severity vulnerability in Ui Usg Firmware with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-94.

Key facts

• Severity: High (CVSS 3.x base score 8.8)
• EPSS exploit prediction: 1% (57th percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-94
• Affected product: Ui Usg Firmware
• Published: 2023-02-09
• Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2023-23912?

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.

How severe is CVE-2023-23912?

CVE-2023-23912 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-23912 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (57th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-23912?

CVE-2023-23912 primarily affects Ui Usg Firmware. In total, 42 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2023-23912?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2023-23912 published?

CVE-2023-23912 was published on 2023-02-09 and last updated on 2026-06-17.

References

• https://community.ui.com/releases/Security-Advisory-Bulletin-028-028/696e4e3b-718c-4da4-9a21-965a85633b5f

Affected products (42)

• cpe:2.3:o:ui:usg_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:ui:usg-pro-4_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:ui:er-10x_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:ui:er-10x_firmware:2.0.9:-:*:*:*:*:*:*
• cpe:2.3:o:ui:er-10x_firmware:2.0.9:hotfix2:*:*:*:*:*:*
• cpe:2.3:o:ui:er-10x_firmware:2.0.9:hotfix4:*:*:*:*:*:*
• cpe:2.3:o:ui:er-10x_firmware:2.0.9:hotfix5:*:*:*:*:*:*
• cpe:2.3:o:ui:er-12_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:ui:er-12_firmware:2.0.9:-:*:*:*:*:*:*
• cpe:2.3:o:ui:er-12_firmware:2.0.9:hotfix2:*:*:*:*:*:*
• cpe:2.3:o:ui:er-12_firmware:2.0.9:hotfix4:*:*:*:*:*:*
• cpe:2.3:o:ui:er-12_firmware:2.0.9:hotfix5:*:*:*:*:*:*
• cpe:2.3:o:ui:er-12p_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:ui:er-12p_firmware:2.0.9:-:*:*:*:*:*:*
• cpe:2.3:o:ui:er-12p_firmware:2.0.9:hotfix2:*:*:*:*:*:*
• cpe:2.3:o:ui:er-12p_firmware:2.0.9:hotfix4:*:*:*:*:*:*
• cpe:2.3:o:ui:er-12p_firmware:2.0.9:hotfix5:*:*:*:*:*:*
• cpe:2.3:o:ui:er-4_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:ui:er-4_firmware:2.0.9:-:*:*:*:*:*:*
• cpe:2.3:o:ui:er-4_firmware:2.0.9:hotfix2:*:*:*:*:*:*
• cpe:2.3:o:ui:er-4_firmware:2.0.9:hotfix4:*:*:*:*:*:*
• cpe:2.3:o:ui:er-4_firmware:2.0.9:hotfix5:*:*:*:*:*:*
• cpe:2.3:o:ui:er-6p_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:ui:er-6p_firmware:2.0.9:-:*:*:*:*:*:*
• cpe:2.3:o:ui:er-6p_firmware:2.0.9:hotfix2:*:*:*:*:*:*
• cpe:2.3:o:ui:er-6p_firmware:2.0.9:hotfix4:*:*:*:*:*:*
• cpe:2.3:o:ui:er-6p_firmware:2.0.9:hotfix5:*:*:*:*:*:*
• cpe:2.3:o:ui:er-8-xg_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:ui:er-8-xg_firmware:2.0.9:-:*:*:*:*:*:*
• cpe:2.3:o:ui:er-8-xg_firmware:2.0.9:hotfix2:*:*:*:*:*:*
• cpe:2.3:o:ui:er-8-xg_firmware:2.0.9:hotfix4:*:*:*:*:*:*
• cpe:2.3:o:ui:er-8-xg_firmware:2.0.9:hotfix5:*:*:*:*:*:*
• cpe:2.3:o:ui:er-x_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:ui:er-x_firmware:2.0.9:-:*:*:*:*:*:*
• cpe:2.3:o:ui:er-x_firmware:2.0.9:hotfix2:*:*:*:*:*:*
• cpe:2.3:o:ui:er-x_firmware:2.0.9:hotfix4:*:*:*:*:*:*
• cpe:2.3:o:ui:er-x_firmware:2.0.9:hotfix5:*:*:*:*:*:*
• cpe:2.3:o:ui:er-x-sfp_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:ui:er-x-sfp_firmware:2.0.9:-:*:*:*:*:*:*
• cpe:2.3:o:ui:er-x-sfp_firmware:2.0.9:hotfix2:*:*:*:*:*:*

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