CVE-2021-20844: Ntt-West Biz Box NVR510 Firmware

Medium severity, CVSS 5.7. EPSS: 1% chance of exploitation in the next 30 days.

Improper neutralization of HTTP request headers for scripting syntax vulnerability in the Web GUI of RTX830 Rev.15.02.17 and earlier, NVR510 Rev.15.01.18 and earlier, NVR700W Rev.15.00.19 and earlier, and RTX1210 Rev.14.01.38 and earlier allows a remote authenticated attacker to obtain sensitive information via a specially crafted web page.

Affected products

• Ntt-West Biz Box NVR510 Firmware: before 15.01.18 (fixed in 15.01.18)
• Ntt-West Biz Box NVR700W Firmware: up to and including 15.00.19
• Ntt-West Biz Box RTX1210 Firmware: up to and including 14.01.38
• Ntt-West Biz Box RTX830 Firmware: up to and including 15.02.17
• Yamaha NVR510 Firmware: up to and including 15.01.18
• Yamaha NVR700W Firmware: up to and including 15.00.19
• Yamaha RTX1210 Firmware: up to and including 14.01.38
• Yamaha RTX830 Firmware: up to and including 15.02.17

Published 2021-11-24. Last modified 2026-06-17.