CVE-2023-30024: Magicjack a921 Firmware

Medium severity, CVSS 6.6. EPSS: 0.5% chance of exploitation in the next 30 days.

The MagicJack device, a VoIP solution for internet phone calls, contains a hidden NAND flash memory partition allowing unauthorized read/write access. Attackers can exploit this by replacing the original software with a malicious version, leading to ransomware deployment on the host computer. Affected devices have firmware versions prior to magicJack A921 USB Phone Jack Rev 3.0 V1.4.

Affected products

• Magicjack a921 Firmware: version 1.4 only

Published 2023-04-28. Last modified 2026-06-17.