CVE-2021-24115: Botan Project Botan

Critical severity, CVSS 9.8. EPSS: 1.9% chance of exploitation in the next 30 days.

In Botan before 2.17.3, constant-time computations are not used for certain decoding and encoding operations (base32, base58, base64, and hex).

Affected products

• Botan Project Botan: before 2.17.3 (fixed in 2.17.3)

Published 2021-02-22. Last modified 2026-06-17.