Simultaneous Multi-threading (SMT) in processors can enable local users to exploit software vulnerable to timing attacks via a…

Description

Simultaneous Multi-threading (SMT) in processors can enable local users to exploit software vulnerable to timing attacks via a side-channel timing attack on 'port contention'.

Scores

EPSS (exploitation in 30 days)

3.4% · top 11% of all CVEs (4 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: no · Technical impact: partial

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 4.7.

Weakness

• CWE-200 (opens in a new tab)All about CWE-200 and its CVEs
• CWE-203 (opens in a new tab)All about CWE-203 and its CVEs

Affected products

• N/A · Processors supporting Simultaneous Multi-Threading

  • affected N/A

References (28)

• RHSA-2019:0483 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
• https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html (opens in a new tab)x_refsource_CONFIRMx_transferred
• https://security.netapp.com/advisory/ntap-20181126-0001/ (opens in a new tab)x_refsource_CONFIRMx_transferred
• USN-3840-1 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
• DSA-4355 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_transferred
• https://www.tenable.com/security/tns-2018-17 (opens in a new tab)x_refsource_CONFIRMx_transferred
• https://nodejs.org/en/blog/vulnerability/november-2018-security-releases/ (opens in a new tab)x_refsource_CONFIRMx_transferred
• GLSA-201903-10 (opens in a new tab)vendor-advisoryx_refsource_GENTOOx_transferred
• https://www.tenable.com/security/tns-2018-16 (opens in a new tab)x_refsource_CONFIRMx_transferred
• 45785 (opens in a new tab)exploitx_refsource_EXPLOIT-DBx_transferred
• [debian-lts-announce] 20181121 [SECURITY] [DLA 1586-1] openssl security update (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• https://github.com/bbbrumley/portsmash (opens in a new tab)x_refsource_MISCx_transferred
• DSA-4348 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_transferred
• 105897 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
• https://eprint.iacr.org/2018/1060.pdf (opens in a new tab)x_refsource_MISCx_transferred
• RHSA-2019:0651 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
• RHSA-2019:0652 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
• https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html (opens in a new tab)x_refsource_MISCx_transferred
• https://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html (opens in a new tab)x_refsource_MISCx_transferred
• RHSA-2019:2125 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
• https://support.f5.com/csp/article/K49711130?utm_source=f5support&amp%3Butm_medium=RSS (opens in a new tab)x_refsource_CONFIRMx_transferred
• RHSA-2019:3929 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
• RHSA-2019:3933 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
• RHSA-2019:3931 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
• RHSA-2019:3935 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
• RHSA-2019:3932 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
• https://www.oracle.com/security-alerts/cpujan2020.html (opens in a new tab)x_refsource_MISCx_transferred
• https://www.oracle.com/security-alerts/cpuapr2020.html (opens in a new tab)x_refsource_MISCx_transferred

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2018-5407](https://trackcve.app/badge/CVE-2018-5407.svg)](https://trackcve.app/cve/CVE-2018-5407)

Record last updated 8 Oct 2026, 21:13 UTC.