CVE-2018-12435: Botan Project Botan

Medium severity, CVSS 5.9. EPSS: 0.5% chance of exploitation in the next 30 days.

Botan 2.5.0 through 2.6.0 before 2.7.0 allows a memory-cache side-channel attack on ECDSA signatures, aka the Return Of the Hidden Number Problem or ROHNP, related to dsa/dsa.cpp, ec_group/ec_group.cpp, and ecdsa/ecdsa.cpp. To discover an ECDSA key, the attacker needs access to either the local machine or a different virtual machine on the same physical host.

Affected products

• Botan Project Botan: from 2.5.0, up to and including 2.7.0

Published 2018-06-15. Last modified 2026-06-17.