CVE-2021-20653: Nec Csdj-A Firmware

Medium severity, CVSS 5.3. EPSS: 1.2% chance of exploitation in the next 30 days.

Calsos CSDJ (CSDJ-B 01.08.00 and earlier, CSDJ-H 01.08.00 and earlier, CSDJ-D 01.08.00 and earlier, and CSDJ-A 03.08.00 and earlier) allows remote attackers to bypass access restriction and to obtain unauthorized historical data without access privileges via unspecified vectors.

Affected products

• Nec Csdj-A Firmware: up to and including 03.08.00
• Nec Csdj-B Firmware: up to and including 01.08.00
• Nec Csdj-D Firmware: up to and including 01.08.00
• Nec Csdj-H Firmware: up to and including 01.08.00

Published 2021-02-17. Last modified 2026-06-17.