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LibTomCrypt through 1.18.1 allows a memory-cache side-channel attack on ECDSA signatures, aka the Return Of the Hidden Number Problem or ROHNP. To discover an ECDSA key, the attacker needs access to either the local machine or a different virtual machine on the same physical host.
Use CWE-200, Libtom vendor hub and Libtomcrypt product page to widen CVE-2018-12437 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2019-17362 and CVE-2016-6129 for nearby disclosures in the same product family.