CVE-2018-5407

MEDIUMNVD 4.74.7—Trending — 4 sources updated this weekElevated

4.7

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'.

CVSS v3: 4.7
EG Score: 4.7(medium)
EPSS: 75.1%
KEV: Not listed

Published

November 15, 2018

Last Modified

November 21, 2024

References (56)

cret@certhttp://www.securityfocus.com/bid/105897
cret@certhttps://access.redhat.com/errata/RHSA-2019:0483
cret@certhttps://access.redhat.com/errata/RHSA-2019:0651
cret@certhttps://access.redhat.com/errata/RHSA-2019:0652
cret@certhttps://access.redhat.com/errata/RHSA-2019:2125
cret@certhttps://access.redhat.com/errata/RHSA-2019:3929
cret@certhttps://access.redhat.com/errata/RHSA-2019:3931
cret@certhttps://access.redhat.com/errata/RHSA-2019:3932
cret@certhttps://access.redhat.com/errata/RHSA-2019:3933
cret@certhttps://access.redhat.com/errata/RHSA-2019:3935
cret@certhttps://eprint.iacr.org/2018/1060.pdf
cret@certhttps://github.com/bbbrumley/portsmash
cret@certhttps://lists.debian.org/debian-lts-announce/2018/11/msg00024.html
cret@certhttps://nodejs.org/en/blog/vulnerability/november-2018-security-releases/
cret@certhttps://security.gentoo.org/glsa/201903-10

Patch Availability(9)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
ubuntu	openssl1.0 (1.0.2n-1ubuntu5.2) @ bionic	2026-05-28	ubuntu
redhat	jbcs-httpd24-openssl-1:1.1.1-25.jbcs.el7	2019-11-20	redhat
redhat	jws5-tomcat-vault-0:1.1.8-1.Final_redhat_1.1.el8jws	2019-11-20	redhat
redhat	openssl	2019-11-20	redhat
redhat	jbcs-httpd24-openssl-1:1.1.1-25.jbcs.el6	2019-11-20	redhat
redhat	ovmf-0:20180508-6.gitee3198e672e2.el7	2019-08-06	redhat
redhat	rhvm-appliance-0:4.3-20190409.0.el7	2019-05-08	redhat
redhat	redhat-virtualization-host-0:4.3-20190409.0.el7_6	2019-05-08	redhat
redhat	openssl-1:1.0.2k-16.el7_6.1	2019-03-13	redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(10)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 12× in last 7d / 17× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-02 20:11 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 00:14 UTCepss_batch
2026-05-31 00:14 UTCepss_batch
2026-05-29 13:41 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-28 13:42 UTCepss_batch
2026-05-28 01:03 UTCEG score recompute
2026-05-28 01:03 UTCVendor advisory
2026-05-28 01:03 UTCGHSA enrichment
2026-05-27 13:38 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

Exploit-DBEDB-45785
First seen Nov 2, 2018
Intel (Skylake / Kaby Lake) - 'PortSmash' CPU SMT Side-Channel
Open source ↗

Frequently asked(5)

What is CVE-2018-5407?

CVE-2018-5407 is a medium vulnerability published on November 15, 2018. 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'.

When was CVE-2018-5407 disclosed?

CVE-2018-5407 was first published in the National Vulnerability Database on November 15, 2018, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2018-5407 actively exploited?

CVE-2018-5407 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 75.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

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

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

How do I remediate CVE-2018-5407?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-5407, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2018-5407

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CVE-2018-5407

Published

Last Modified

References (56)

Patch Availability(9)

Weakness Classification(2)

All Vendor Advisories

Data Freshness Timeline

Publicly available exploits

Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2018-5407?

Same vendor

Same CWE

CVE-2018-5407

📅 Published

🔄 Last Modified

🔗 References (56)

Patch Availability(9)

Weakness Classification(2)

All Vendor Advisories

Data Freshness Timeline

Publicly available exploits

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2018-5407?

🔗 Related CVEs(same vendor + same CWE)

Same vendor

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Published

Last Modified

References (56)

Frequently asked(5)

Related CVEs(same vendor + same CWE)