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Vulnerability record · CVE-2018-12437 · published 15 June 2018

CVE-2018-12437: Libtomcrypt information exposure vulnerability

Libtom · Libtomcrypt

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.

4.9 CVSS 3.1 Medium EPSS 0.54% · top 56.3% CWE-200 · Information exposure
4.9CVSS 3.1 base score, v2 1.9
0.54%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
4References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://security.gentoo.org/glsa/202007-53 Third Party Advisory
https://www.nccgroup.trust/us/our-research/technical-advisory-return-of-the-hidden-number-problem/ ExploitTechnical DescriptionThird Party Advisory
https://security.gentoo.org/glsa/202007-53 Third Party Advisory
https://www.nccgroup.trust/us/our-research/technical-advisory-return-of-the-hidden-number-problem/ ExploitTechnical DescriptionThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2018-12437), CISA KEV, FIRST EPSS (scores of 2026-10-09). This page is refreshed as NVD updates the record.