CVE-2020-15350: Riot-OS Riot

Critical severity, CVSS 9.8. EPSS: 1.5% chance of exploitation in the next 30 days.

RIOT 2020.04 has a buffer overflow in the base64 decoder. The decoding function base64_decode() uses an output buffer estimation function to compute the required buffer capacity and validate against the provided buffer size. The base64_estimate_decode_size() function calculates the expected decoded size with an arithmetic round-off error and does not take into account possible padding bytes. Due to this underestimation, it may be possible to craft base64 input that causes a buffer overflow.

Affected products

• Riot-OS Riot: version 2020.04 only

Published 2020-07-07. Last modified 2026-06-17.