CVE-2020-15566

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

0.41% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 34.0% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

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

NVD analysis status

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

Red Hat severity

Moderate. 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

2020-07-07 12:23Z6 YR AGO

Last updated

2024-08-04 13:22Z2 YR AGO

Reserved

2020-07-06

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-754Improper Check for Unusual or Exceptional ConditionsClass
• CWE-392Missing Report of Error ConditionBase

Data version

5.1

Document digest

d69766eec886d62f49668ccd669690a560f27e2ff8a944b4e95be19569f7a610

• xenbits.xen.orghttp://xenbits.xen.org/xsa/advisory-317.htmlx_refsource_MISC
• www.openwall.com[oss-security] 20200707 Xen Security Advisory 317 v3 (CVE-2020-15566) - Incorrect error handling in event channel port allocationhttp://www.openwall.com/lists/oss-security/2020/07/07/2mailing-listx_refsource_MLIST
• www.debian.orgDSA-4723https://www.debian.org/security/2020/dsa-4723vendor-advisoryx_refsource_DEBIAN
• lists.opensuse.orgopenSUSE-SU-2020:0965http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00024.htmlvendor-advisoryx_refsource_SUSE
• lists.fedoraproject.orgFEDORA-2020-fbc13516afhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VB3QJJZV23Z2IDYEMIHELWYSQBUEW6JP/vendor-advisoryx_refsource_FEDORA
• lists.opensuse.orgopenSUSE-SU-2020:0985http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00031.htmlvendor-advisoryx_refsource_SUSE
• lists.fedoraproject.orgFEDORA-2020-76cf2b0f0ahttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MXESCOVI7AVRNC7HEAMFM7PMEO6D3AUH/vendor-advisoryx_refsource_FEDORA
• security.gentoo.orgGLSA-202007-02https://security.gentoo.org/glsa/202007-02vendor-advisoryx_refsource_GENTOO