CVE-2023-23912: UI Er-10x Firmware

High severity, CVSS 8.8. EPSS: 1% chance of exploitation in the next 30 days.

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.

Affected products

• UI Er-10x Firmware: before 2.0.9 (fixed in 2.0.9); version 2.0.9 only
• UI Er-12 Firmware: before 2.0.9 (fixed in 2.0.9); version 2.0.9 only
• UI Er-12p Firmware: before 2.0.9 (fixed in 2.0.9); version 2.0.9 only
• UI Er-4 Firmware: before 2.0.9 (fixed in 2.0.9); version 2.0.9 only
• UI Er-6p Firmware: before 2.0.9 (fixed in 2.0.9); version 2.0.9 only
• UI Er-8-XG Firmware: before 2.0.9 (fixed in 2.0.9); version 2.0.9 only
• UI Er-X-Sfp Firmware: before 2.0.9 (fixed in 2.0.9); version 2.0.9 only
• UI Er-X Firmware: before 2.0.9 (fixed in 2.0.9); version 2.0.9 only
• UI Usg-Pro-4 Firmware: before 4.4.57 (fixed in 4.4.57)
• UI Usg Firmware: before 4.4.57 (fixed in 4.4.57)

Published 2023-02-09. Last modified 2026-06-17.