CVE-2018-12433: Cryptlib

Medium severity, CVSS 4.9. EPSS: 0.3% chance of exploitation in the next 30 days.

cryptlib through 3.4.4 allows a memory-cache side-channel attack on DSA and ECDSA signatures, aka the Return Of the Hidden Number Problem or ROHNP. To discover a key, the attacker needs access to either the local machine or a different virtual machine on the same physical host. NOTE: the vendor does not include side-channel attacks within its threat model

Affected products

• Cryptlib Cryptlib: up to and including 3.4.4

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