libtomcrypt: memory-cache side-channel attack on ECDSA signatures
Published Jun 15, 2018
4.9
MEDIUMCVSS 3.1
EPSS 0.54%
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.
Affected products
No data.
Configuration 1
- ≤ 1.18.1
Configuration 2
- ≤ 3.5.0
No data.
CloudForms Management Engine 5
libtomcrypt
Not affected
Red Hat Ansible Engine 2
libtomcrypt
Not affected
Red Hat Enterprise Linux 7
libtomcrypt
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| CloudForms Management Engine 5 | libtomcrypt | Not affected | n/a |
| Red Hat Ansible Engine 2 | libtomcrypt | Not affected | n/a |
| Red Hat Enterprise Linux 7 | libtomcrypt | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
This flaw was found to be a duplicate of CVE-2018-0495. Please see https://access.redhat.com/security/cve/CVE-2018-0495 for information about affected products and security errata.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
AV:L/AC:M/Au:N/C:P/I:N/A:N
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
Table of values (9 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.54% (0.00540) | 43.38th | v5 (v2026.06.15) |
| Sep 20, 2026 | 0.54% (0.00540) | 44.35th | v5 (v2026.06.15) |
| Jul 20, 2024 | 0.14% (0.00142) | 50.47th | v3 (v2023.03.01) |
| Jun 20, 2024 | 0.14% (0.00142) | 50.22th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.14% (0.00142) | 48.20th | v3 (v2023.03.01) |
| Mar 6, 2023 | 0.89% (0.00885) | 27.89th | v2 (v2022.01.01) |
| Feb 4, 2022 | 0.89% (0.00885) | 10.50th | v2 (v2022.01.01) |
| Feb 3, 2022 | 0.62% (0.00624) | 17.80th | v5 (v2026.06.15) |
| Apr 14, 2021 | 0.62% (0.00624) | 0.00th | v1 |
References (6)
- https://access.redhat.com/security/cve/CVE-2018-12437 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1591904 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2018-12437
- https://security.gentoo.org/glsa/202007-53 vendor-advisoryx_refsource_GENTOOThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2018-12437
- https://www.nccgroup.trust/us/our-research/technical-advisory-return-of-the-hidden-number-problem/ x_refsource_MISCExploitTechnical DescriptionThird Party Advisory
| Link | Providers | Tags |
|---|---|---|
| https://access.redhat.com/security/cve/CVE-2018-12437 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1591904 | Issue Tracking | |
| https://nvd.nist.gov/vuln/detail/CVE-2018-12437 | ||
| https://security.gentoo.org/glsa/202007-53 | vendor-advisoryx_refsource_GENTOOThird Party Advisory | |
| https://www.cve.org/CVERecord?id=CVE-2018-12437 | ||
| https://www.nccgroup.trust/us/our-research/technical-advisory-return-of-the-hidden-number-problem/ | x_refsource_MISCExploitTechnical DescriptionThird Party Advisory |
Change history (0)
No recorded changes yet.