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Fencer Intel
medium 5.9

CVE-2011-4600 json

The networkReloadIptablesRules function in network/bridge_driver.c in libvirt before 0.9.9 does not properly handle firewall rules on bridg…

published 2016-04-14 10 y ago modified 2026-06-16 4 mo ago also EUVD-2011-4524

cvss
5.9
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.8%
EPSS 1.8% chance of exploitation in 30 days, percentile 78%
public exploits
0
none known

Summary

The networkReloadIptablesRules function in network/bridge_driver.c in libvirt before 0.9.9 does not properly handle firewall rules on bridge networks when libvirtd is restarted, which might allow remote attackers to bypass intended access restrictions via a (1) DNS or (2) DHCP query.

Patch / fix

  • libvirt Debian 14, Debian 13, Debian 12 0.9.9-1

debian advisories DEBIAN-CVE-2011-4600

  • libvirt RHEL 6.2 EUS 0.9.4-23.el6_2.4
  • libvirt-client RHEL 6.2 EUS 0.9.4-23.el6_2.4
  • libvirt-python RHEL 6.2 EUS 0.9.4-23.el6_2.4
  • libvirt-lock-sanlock RHEL 6.2 EUS 0.9.4-23.el6_2.4

red hat advisories RHBA-2012:0013

  • libvirt openSUSE Tumbleweed 2.5.0-1.1

opensuse advisories openSUSE-SU-2024:10209-1

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-2011-4600 updated cvss 2.6

libvirt: unintended firewall port exposure after restarting libvirtd when defining a bridged forward-mode network

  • Red Hat Enterprise Linux 6 libvirt, libvirt-client, libvirt-python, libvirt-lock-sanlock
    affected: no fix available
  • Red Hat Enterprise Linux Server EUS (v. 6.2) libvirt 0.9.4-23.el6_2.4, libvirt-client 0.9.4-23.el6_2.4, libvirt-python 0.9.4-23.el6_2.4 Red Hat Enterprise Linux Server Optional EUS (v. 6.2) libvirt 0.9.4-23.el6_2.4, libvirt-lock-sanlock 0.9.4-23.el6_2.4
    fixed: vendor fix RHBA-2012:0013
  • Red Hat Enterprise Linux 5 libvirt
    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

1.78% chance of exploitation in the next 30 days, higher than 78% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.0 5.9 CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:P/A:N

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.