CVE-2019-18421

Exploitation

Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.

SSVC decision

Not assessed by CISA

EPSS probability

1.68% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 74.9% of scored records. A rank, not a probability.

NVD base score

7.5 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

Important. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2019-10-31 13:34Z6 YR AGO

Last updated

2024-08-05 01:54Z2 YR AGO

Reserved

2019-10-24

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')Class
• CWE-268Privilege ChainingBase

Data version

5.1

Document digest

a05b75cda557db559d8094b2479ef3043f3f5daaf3c1d76704f9654934da1df0

• xenbits.xen.orghttp://xenbits.xen.org/xsa/advisory-299.htmlx_refsource_MISC
• www.openwall.com[oss-security] 20191031 Xen Security Advisory 299 v4 (CVE-2019-18421) - Issues with restartable PV type change operationshttp://www.openwall.com/lists/oss-security/2019/10/31/3mailing-listx_refsource_MLIST
• lists.opensuse.orgopenSUSE-SU-2019:2506http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00037.htmlvendor-advisoryx_refsource_SUSE
• lists.fedoraproject.orgFEDORA-2019-865bb16900https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2BQKX7M2RHCWDBKNPX4KEBI3MJIH6AYZ/vendor-advisoryx_refsource_FEDORA
• lists.fedoraproject.orgFEDORA-2019-376ec5c107https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/I5WWPW4BSZDDW7VHU427XTVXV7ROOFFW/vendor-advisoryx_refsource_FEDORA
• lists.fedoraproject.orgFEDORA-2019-cbb732f760https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IZYATWNUGHRBG6I3TC24YHP5Y3J7I6KH/vendor-advisoryx_refsource_FEDORA
• www.debian.orgDSA-4602https://www.debian.org/security/2020/dsa-4602vendor-advisoryx_refsource_DEBIAN
• seclists.org20200114 [SECURITY] [DSA 4602-1] xen security updatehttps://seclists.org/bugtraq/2020/Jan/21mailing-listx_refsource_BUGTRAQ
• security.gentoo.orgGLSA-202003-56https://security.gentoo.org/glsa/202003-56vendor-advisoryx_refsource_GENTOO