CVE-2018-12437

Exp

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.

Published: 2018-06-15 Last update: 2026-06-05 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2018-12437 is rated Exploit Available (50/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.08%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2018-12437

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2018-12437

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-03-30 0.21% 0.08% -0.12%
2 2025-03-29 0.14% 0.21% +0.06%
3 2023-03-07 — 0.14% —

Full EPSS history (5 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2018-12437

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
4.9 3.1 MEDIUM
CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N Click to expand
Attack vector (AV:P)
Hands-on access—USB, keyboard, opening the case—not something you do purely over the wire.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 0.5 4.0 [email protected]
1.9 2.0 LOW
AV:L/AC:M/Au:N/C:P/I:N/A:N Click to expand
Access vector (AV:L)
Requires local access to the target system.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 3.4 2.9 [email protected]

Weakness enumeration for CVE-2018-12437

OS Trackers for CVE-2018-12437

vendor priority summary link
debian low CVE-2018-12437 low priority: Debian including 1 source packages (libtomcrypt), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2018-12437
gentoo normal CVE-2018-12437: 1 GLSA(s) (202007-53), 1 atom(s) (net-misc/dropbear); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2018-12437
redhat — — https://access.redhat.com/security/cve/CVE-2018-12437
ubuntu medium CVE-2018-12437 medium priority: Ubuntu including 1 source packages (libtomcrypt), 5 status rows across 5 suites (artful, bionic, trusty, upstream, xenial): released 3, ignored 1, needs-triage 1. https://ubuntu.com/security/CVE-2018-12437

Affected software / configurations for CVE-2018-12437

Vendor Product Version Raw CPE
libtom libtomcrypt <= 1.18.1 cpe:2.3:a:libtom:libtomcrypt:*:*:*:*:*:*:*:*
trustedfirmware op-tee <= 3.5.0 cpe:2.3:o:trustedfirmware:op-tee:*:*:*:*:*:*:*:*

References for CVE-2018-12437

cvelogic Threat Intelligence