CVE-2017-1000256: Debian Linux

High severity, CVSS 8.1. EPSS: 1.7% chance of exploitation in the next 30 days.

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 Debian Linux: version 9.0 only
• Red Hat Libvirt: from 2.3.0, before 3.9.0 (fixed in 3.9.0)

Published 2017-10-31. Last modified 2026-06-17.