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Vulnerability details: VCID-c384-3rsb-wkap
Vulnerability ID VCID-c384-3rsb-wkap
Aliases CVE-2018-12437
Summary 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.
Status Published
Exploitability 0.5
Weighted Severity 5.0
Risk 2.5
Affected and Fixed Packages Package Details
Weaknesses (2)
CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
CWE-385 Covert Timing Channel
System Score Found at
cvssv3 5.5 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2018-12437.json
epss 0.00082 https://api.first.org/data/v1/epss?cve=CVE-2018-12437
epss 0.00082 https://api.first.org/data/v1/epss?cve=CVE-2018-12437
epss 0.00082 https://api.first.org/data/v1/epss?cve=CVE-2018-12437
epss 0.00082 https://api.first.org/data/v1/epss?cve=CVE-2018-12437
epss 0.00082 https://api.first.org/data/v1/epss?cve=CVE-2018-12437
epss 0.00082 https://api.first.org/data/v1/epss?cve=CVE-2018-12437
epss 0.00082 https://api.first.org/data/v1/epss?cve=CVE-2018-12437
epss 0.00082 https://api.first.org/data/v1/epss?cve=CVE-2018-12437
epss 0.00082 https://api.first.org/data/v1/epss?cve=CVE-2018-12437
epss 0.00082 https://api.first.org/data/v1/epss?cve=CVE-2018-12437
epss 0.00082 https://api.first.org/data/v1/epss?cve=CVE-2018-12437
epss 0.00082 https://api.first.org/data/v1/epss?cve=CVE-2018-12437
epss 0.00082 https://api.first.org/data/v1/epss?cve=CVE-2018-12437
epss 0.00082 https://api.first.org/data/v1/epss?cve=CVE-2018-12437
epss 0.00082 https://api.first.org/data/v1/epss?cve=CVE-2018-12437
epss 0.00082 https://api.first.org/data/v1/epss?cve=CVE-2018-12437
epss 0.00082 https://api.first.org/data/v1/epss?cve=CVE-2018-12437
epss 0.00082 https://api.first.org/data/v1/epss?cve=CVE-2018-12437
epss 0.00082 https://api.first.org/data/v1/epss?cve=CVE-2018-12437
cvssv2 1.9 https://nvd.nist.gov/vuln/detail/CVE-2018-12437
cvssv3.1 4.9 https://nvd.nist.gov/vuln/detail/CVE-2018-12437
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2018-12437.json
https://api.first.org/data/v1/epss?cve=CVE-2018-12437
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-12437
https://security.gentoo.org/glsa/202007-53
https://www.nccgroup.trust/us/our-research/technical-advisory-return-of-the-hidden-number-problem/
1591904 https://bugzilla.redhat.com/show_bug.cgi?id=1591904
901626 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=901626
cpe:2.3:a:libtom:libtomcrypt:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:libtom:libtomcrypt:*:*:*:*:*:*:*:*
cpe:2.3:o:linaro:op-tee:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:linaro:op-tee:*:*:*:*:*:*:*:*
CVE-2018-12437 https://nvd.nist.gov/vuln/detail/CVE-2018-12437
No exploits are available.
Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2018-12437.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: AV:L/AC:M/Au:N/C:P/I:N/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2018-12437
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2018-12437
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.24947
EPSS Score 0.00082
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T09:57:16.775325+00:00 NVD Importer Import https://nvd.nist.gov/vuln/detail/CVE-2018-12437 37.0.0