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Fencer Intel
low 2.7

CVE-2014-4021 json

Xen 3.2.x through 4.4.x does not properly clean memory pages recovered from guests, which allows local guest OS users to obtain sensitive i…

published 12y ago modified 4mo ago also EUVD-2014-3953

cvss
2.7
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 52%
public exploits
0
none known

Summary

Xen 3.2.x through 4.4.x does not properly clean memory pages recovered from guests, which allows local guest OS users to obtain sensitive information via unspecified vectors.

Patch / fix

  • xen Debian 14, Debian 13, Debian 12 4.4.1-1

debian advisories DEBIAN-CVE-2014-4021

  • xen Ubuntu 14.04 LTS 4.4.0-0ubuntu5.1

ubuntu advisories UBUNTU-CVE-2014-4021

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • kernel RHEL 5 2.6.18-371.11.1.el5
  • kernel-PAE RHEL 5 2.6.18-371.11.1.el5
  • kernel-xen RHEL 5 2.6.18-371.11.1.el5
  • kernel-kdump RHEL 5 2.6.18-371.11.1.el5
  • kernel-debuginfo-common RHEL 5 2.6.18-371.11.1.el5

red hat advisories RHSA-2014:0926

Is CVE-2014-4021 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2014-4021 updated cvss 2.3

xen: Hypervisor heap contents leaked to guests (xsa-100)

  • Red Hat Enterprise Linux (v. 5 server) kernel 2.6.18-371.11.1.el5, kernel-PAE 2.6.18-371.11.1.el5, kernel-xen 2.6.18-371.11.1.el5, kernel-kdump 2.6.18-371.11.1.el5, kernel-debuginfo-common 2.6.18-371.11.1.el5 Red Hat Enterprise Linux Desktop (v. 5 client) kernel 2.6.18-371.11.1.el5, kernel-PAE 2.6.18-371.11.1.el5, kernel-xen 2.6.18-371.11.1.el5, kernel-debuginfo-common 2.6.18-371.11.1.el5
    fixed: vendor fix RHSA-2014:0926

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.68% chance of exploitation in the next 30 days, higher than 52% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 2.0 2.7 AV:A/AC:L/Au:S/C:P/I:N/A:N

Classification

Weakness
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.