What’s Vulnerable › Vulnerabilities

CVE-2017-1000256

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2017-10-31 · updated 2026-06-17
• Weakness: CWE-295

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.

Affected products

• Debian Linux: 9.0
• libvirt: from 2.3.0 before 3.9.0 — fixed in 3.9.0

How to fix

Upgrade to a fixed version: libvirt 3.9.0. Check the vendor advisory for mitigations.

References

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

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