Is CVE-2018-12437 in the CISA KEV catalog?

No. CVE-2018-12437 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2018-12437?

CVE-2018-12437 has a CVSS v3 base score of 4.9 (MEDIUM).

What is the EPSS score for CVE-2018-12437?

CVE-2018-12437 has an EPSS score of 0.54% (42th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2018-12437?

Upgrade libtomcrypt on debian 11 to 1.18.2-1 or later.

CVE & CISA-KEV Catalog

CVE-2018-12437

MEDIUM

4.9

CVSS v3

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.

CWE-200Information Exposure

How to fix

Remediation Available

libtomcryptDebian

Fixed in:1.18.2-1CVE-2018-12437

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorPhysical

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeChanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

0.54%probability of exploitation in 30 days

42ndpercentile

Moderate risk: more likely to be exploited than 42% of all known CVEs.

References

Exploit1

nccgroup.trust

Third-Party Advisory1

security.gentoo.org

Related Vulnerabilities

Other CWE-200 (Information Exposure) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-24919	High	8.6	100%	KEV + Ransom	-
CVE-2020-14181	Medium	5.3	100%	-	Fix
CVE-2021-34429	Medium	5.3	99%	-	Fix
CVE-2018-11409	Medium	5.3	98%	-	-
CVE-2021-41277	Critical	10.0	97%	KEV	-
CVE-2016-2183	High	7.5	96%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-05.