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Vulnerability record · CVE-2017-1000256 · published 31 October 2017

CVE-2017-1000256: Redhat libvirt improper certificate validation vulnerability

Redhat · Libvirt

libvirt version 2.3.0 and later is vulnerable to a bad default configuration of "verify-peer=no" passed to QEMU by libvirt resulting in a failure to validate SSL/TLS certificates by default.

8.1 CVSS 3.1 High EPSS 1.7% · top 23.7% CWE-295 · Improper certificate validation
8.1CVSS 3.1 base score, v2 6.8
1.7%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
8References
17 Jun 2026Last modified by NVD

Description

libvirt version 2.3.0 and later is vulnerable to a bad default configuration of "verify-peer=no" passed to QEMU by libvirt resulting in a failure to validate SSL/TLS certificates by default.

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

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.debian.org/security/2017/dsa-4003 Third Party Advisory
https://access.redhat.com/security/cve/CVE-2017-1000256 Issue TrackingVendor Advisory
https://www.mail-archive.com/debian-bugs-dist%40lists.debian.org/msg1556251.html
https://www.redhat.com/archives/libvirt-announce/2017-October/msg00001.html Issue TrackingVendor Advisory
http://www.debian.org/security/2017/dsa-4003 Third Party Advisory
https://access.redhat.com/security/cve/CVE-2017-1000256 Issue TrackingVendor Advisory
https://www.mail-archive.com/debian-bugs-dist%40lists.debian.org/msg1556251.html
https://www.redhat.com/archives/libvirt-announce/2017-October/msg00001.html Issue TrackingVendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2017-1000256), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.