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MEDIUM

CVE-2018-5407

CVSS v3

4.7

MEDIUM

EPSS Score

3.4 %

exploit probability, as of 2026-10-19

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

  • CVE-2018-5407 Red Hat Product Security383 products fixed · 17 known affected

    openssl: Side-channel vulnerability on SMT/Hyper-Threading architectures (PortSmash)

    openssl.src as a component of Red Hat Enterprise Linux 5 · openssl097a.src as a component of Red Hat Enterprise Linux 5 · openssl as a component of Red Hat Enterprise Linux 6

  • RHSA-2019:3932 Red Hat Product Security110 products fixed

    Red Hat Security Advisory: Red Hat JBoss Core Services Apache HTTP Server 2.4.37 Security Release on RHEL 6

  • RHSA-2019:3933 Red Hat Product Security61 products fixed

    Red Hat Security Advisory: Red Hat JBoss Core Services Apache HTTP Server 2.4.37 Security Release on RHEL 7

  • RHSA-2019:3929 Red Hat Product Security83 products fixed

    Red Hat Security Advisory: Red Hat JBoss Web Server 5.2 security release

  • RHSA-2019:3935 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat JBoss Core Services Apache HTTP Server 2.4.37 Security Release

  • RHSA-2019:3931 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat JBoss Web Server 5.2 security release

4 more advisories

Full record on NVD

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'.

Technical details

Published
2018-11-15
Exploit-DB
EDB-45785

Frequently asked questions

What is CVE-2018-5407?

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'.

Is CVE-2018-5407 actively exploited?

Active exploitation of CVE-2018-5407 has not been confirmed. Its EPSS score was 3.4% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2018-5407?

CVE-2018-5407 has a CVSS v3 base score of 4.7 (MEDIUM severity).

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