What is CVE-2005-0109?

CVE-2005-0109 is a medium-severity vulnerability in FreeBSD. CVSS score: 5.6/10. Published 2005-03-05.

How severe is CVE-2005-0109?

Medium severity. CVSS v3 base score is 5.6 out of 10.

Vulnerability in FreeBSD

CVE-2005-0109

Hyper-Threading technology, as used in FreeBSD and other operating systems that are run on Intel Pentium and other processors, allows local users to use a malicious thread to create covert channels, monitor the execution of other threads, and obtain sensitive information such as cryptographic keys, via a timing attack on memory cache misses.

Published 2005-03-05 · last modified 2026-06-16.

CVSS v3 metric

CVSS v3 base score 5.6 (Medium). Vector: CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.005 (43.5th percentile), scored 2026-11-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 43rd percentile — 43.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

FreeBSD — versions 1.1.5.1, 2.0, 2.0.5
SCO Openserver — versions 5.0.7
SCO Unixware — versions 7.1.3, 7.1.3_up, 7.1.4
Sun Solaris — versions 7.0, 8.0, 9.0
Red Hat Enterprise Linux — versions 2.1, 3.0, 4.0
Red Hat Enterprise Linux Desktop — versions 3.0, 4.0
Red Hat Fedora Core — versions core_3.0
Ubuntu Linux — versions 4.1, 5.04

References

www.kb.cert.org/vuls/id/911878 (US Government Resource, Third Party Advisory, third-party-advisory)
secunia.com/advisories/18165 (Permissions Required, third-party-advisory)
www-1.ibm.com/support/docview.wss (Broken Link)
marc.info/ (mailing-list, Mailing List)
oval.cisecurity.org/repository/search/definition/oval:org.mitre.oval:def:9747 (signature, Third Party Advisory, vdb-entry)
www.vupen.com/english/advisories/2005/3002 (Permissions Required, vdb-entry)
secunia.com/advisories/15348 (Permissions Required, third-party-advisory)
www.securityfocus.com/bid/12724 (Patch, VDB Entry, Third Party Advisory, vdb-entry, Vendor Advisory)
marc.info/ (mailing-list, Mailing List)
www.redhat.com/support/errata/RHSA-2005-476.html (vendor-advisory, Not Applicable)

Frequently asked questions

What is CVE-2005-0109?: CVE-2005-0109 is a medium-severity vulnerability in FreeBSD. CVSS score: 5.6/10. Published 2005-03-05.
How severe is CVE-2005-0109?: Medium severity. CVSS v3 base score is 5.6 out of 10.