CVE-2017-1000256

Name: CVE-2017-1000256
Creator: NVD / NIST
Published: 2017-10-31T15:29:00.24+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.1/10EPSS 1.70%

Last modified Jun 17, 2026

CVE-2017-1000256 is a high-severity vulnerability rated 8.1/10 on the CVSS scale. 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.. EPSS estimates a 1.70% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

8.1/10

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

EPSS Probability

1.70%

74.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-295

Affected Software

Vendor	Product	Versions
Redhat	Libvirt	>= 2.3.0, < 3.9.0
Debian	Debian Linux	9.0

References

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

Timeline

Published: Oct 31, 2017
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2017-1000256?

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.

How severe is CVE-2017-1000256?

CVE-2017-1000256 has a CVSS score of 8.1/10 (HIGH severity). The EPSS model estimates a 1.70% probability of exploitation in the next 30 days.

How do I fix CVE-2017-1000256?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2017-1000256?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST