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Fencer Vulns
high 8.1

CVE-2017-1000256 json

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 f…

published 2017-10-31 9 y ago modified 2026-06-17 4 mo ago also EUVD-2017-1517

cvss
8.1
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.7%
EPSS 1.7% chance of exploitation in 30 days, percentile 77%
public exploits
0
none known

Summary

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.

Patch / fix

  • redhat libvirt 3.9.0
  • libvirt Debian 14, Debian 13, Debian 12 3.8.0-3

debian advisories DEBIAN-CVE-2017-1000256

  • libvirt SLES for SAP 12 SP3, SLES 12 SP3, SLED 12 SP3 +1 more 3.3.0-5.8.1

suse advisories SUSE-SU-2017:2850-1

  • libvirt openSUSE Tumbleweed 7.7.0-2.1

opensuse advisories openSUSE-SU-2024:11008-1

  • libvirt Alpine 3.5 2.5.0-r2
  • libvirt Alpine 3.6 3.3.0-r2

alpine advisories ALPINE-CVE-2017-1000256

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2017-1000256 updated cvss 5.0

libvirt: TLS certificate verification disabled for clients

  • Red Hat Enterprise Linux 5 libvirt Red Hat Enterprise Linux 6 libvirt, libvirt-client, libvirt-python, libvirt-lock-sanlock Red Hat Enterprise Linux 7 libvirt, libvirt-nss, libvirt-libs, libvirt-admin, libvirt-client, libvirt-daemon, +24 more Red Hat Enterprise Virtualization 3 mingw-virt-viewer, mingw32-virt-viewer, mingw64-virt-viewer
    affected: no fix planned “Will not fix”
  • Red Hat Storage 3 libvirt-lock-sanlock
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.71% chance of exploitation in the next 30 days, higher than 77% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 8.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P

Classification

Weakness
  • CWE-295 Improper Certificate Validation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.