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CVE-2016-5008

32
FAUCET Score

CVE-2016-5008 describes a critical vulnerability in libvirt versions prior to 2.0.0, affecting Debian and Red Hat distributions. This flaw allows remote attackers to bypass VNC server authentication by exploiting an improper password checking mechanism when an empty string is configured as the password. With a CVSS score of 9.8 (Critical), this vulnerability permits unauthenticated attackers to achieve full compromise of confidentiality, integrity, and availability. Despite its high severity, there is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 1.3.5CPE matchmatch criteria
cpe:2.3:a:redhat:libvirt:*:*:*:*:*:*:*:*
8.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

9.8CRITICAL

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
3.62%
Probability of exploitation in next 30 days
EPSS Percentile
88.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0362 is in the 81st percentile among its peer group of 36,829 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (5)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: libvirt-0:2.0.0-10.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Gluster Storage 3.1 for RHEL 7Fixed in: libvirt-0:2.0.0-10.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Virtualization 4 for Red Hat Enterprise Linux 7Fixed in: libvirt-0:2.0.0-10.el7
View patch
redhatvendor investigatingvia redhat_api
Product: Red Hat Enterprise Virtualization 3Fixed in: mingw-virt-viewer
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: libvirt

Vendor Advisories (1)

redhatCVE-2016-5008Moderate

libvirt: Setting empty VNC password allows access to unauthorized users

Jan 18, 2015

References

lists.opensuse.org / opensuse-updates/2016-07/msg00054.html
lists.opensuse.org / opensuse-updates/2016-07/msg00055.html
lists.opensuse.org / opensuse-updates/2016-08/msg00024.html
rhn.redhat.com / errata/RHSA-2016-2577.html
bugzilla.redhat.com / show_bug.cgi
security.libvirt.org / 2016/0001.html
Vendor Advisory
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/DZZMOMRXNPALA34XDF5NK363KDLAYSTL
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/QTQF6LXKEEMJG4VOOCIAPJAD6ACBYP4W
usn.ubuntu.com / 3576-1
debian.org / security/2016/dsa-3613
securityfocus.com / bid/91562