CVE-2016-6669: Huawei USG2100 Firmware

High severity, CVSS 7.5. EPSS: 3.3% chance of exploitation in the next 30 days.

Buffer overflow in the Authentication, Authorization and Accounting (AAA) module in Huawei USG2100, USG2200, USG5100, and USG5500 unified security gateways with software before V300R001C10SPC600 allows remote authenticated RADIUS servers to execute arbitrary code by sending a crafted EAP packet.

Affected products

• Huawei USG2100 Firmware: up to and including v300r001c00; up to and including v300r001c10
• Huawei USG2200 Firmware: up to and including v300r001c00; up to and including v300r001c10
• Huawei USG5100 Firmware: up to and including v300r001c00; up to and including v300r001c10
• Huawei USG5500 Firmware: up to and including v300r001c00; up to and including v300r001c10

Published 2016-09-22. Last modified 2026-06-17.