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Fencer Intel
medium 4.3

CVE-2011-0011 json

qemu-kvm before 0.11.0 disables VNC authentication when the password is cleared, which allows remote attackers to bypass authentication and…

published 2012-06-21 14 y ago modified 2026-06-16 4 mo ago also EUVD-2011-0038

cvss
4.3
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.3%
EPSS 1.3% chance of exploitation in 30 days, percentile 70%
public exploits
0
none known

Summary

qemu-kvm before 0.11.0 disables VNC authentication when the password is cleared, which allows remote attackers to bypass authentication and establish VNC sessions.

Patch / fix

  • qemu-kvm RHEL 6 2:0.12.1.2-2.113.el6_0.8
  • qemu-img RHEL 6 2:0.12.1.2-2.113.el6_0.8
  • qemu-kvm-tools RHEL 6 2:0.12.1.2-2.113.el6_0.8

red hat advisories RHSA-2011:0345

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-2011-0011 updated cvss 4.3

qemu-kvm: Setting VNC password to empty string silently disables all authentication

  • Red Hat Enterprise Linux Desktop (v. 6) qemu-img 0.12.1.2-2.113.el6_0.8, qemu-kvm 0.12.1.2-2.113.el6_0.8, qemu-kvm-tools 0.12.1.2-2.113.el6_0.8 Red Hat Enterprise Linux HPC Node (v. 6) qemu-img 0.12.1.2-2.113.el6_0.8, qemu-kvm 0.12.1.2-2.113.el6_0.8, qemu-kvm-tools 0.12.1.2-2.113.el6_0.8 Red Hat Enterprise Linux Server (v. 6) qemu-img 0.12.1.2-2.113.el6_0.8, qemu-kvm 0.12.1.2-2.113.el6_0.8, qemu-kvm-tools 0.12.1.2-2.113.el6_0.8 Red Hat Enterprise Linux Workstation (v. 6) qemu-img 0.12.1.2-2.113.el6_0.8, qemu-kvm 0.12.1.2-2.113.el6_0.8, qemu-kvm-tools 0.12.1.2-2.113.el6_0.8
    fixed: vendor fix RHSA-2011:0345

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

1.29% chance of exploitation in the next 30 days, higher than 70% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 2.0 4.3 AV:A/AC:H/Au:N/C:P/I:P/A:P

Classification

Weakness

References

Sources

Fencer Intel 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.