The flash memory readout protection in Gigadevice GD32F103 devices allows physical attackers to extract firmware via the debug interface by utilizing the DMA module.
Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-13472
Reference (s):
- https://www.usenix.org/system/files/woot20-paper-obermaier.pdf