libvirt: unintended firewall port exposure after restarting libvirtd when defining a bridged forward-mode network
Published Apr 14, 2016
5.9
MEDIUMCVSS 3.0
EPSS 1.78%
Description
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.
Affected products
No data.
Configuration 1
- 12.04
- 14.04
- 15.04
- 15.10
No data.
Red Hat Enterprise Linux 6.2 EUS - Server and Compute Node Only
libvirt-0:0.9.4-23.el6_2.4
Fixed · RHBA-2012:0013
Red Hat Enterprise Linux 5
libvirt
Not affected
Red Hat Enterprise Linux 6
libvirt
Affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 6.2 EUS - Server and Compute Node Only | libvirt-0:0.9.4-23.el6_2.4 | Fixed | RHBA-2012:0013 |
| Red Hat Enterprise Linux 5 | libvirt | Not affected | n/a |
| Red Hat Enterprise Linux 6 | libvirt | Affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
This issue affect Red Hat Enterprise Linux 6 and has been addressed via https://rhn.redhat.com/errata/RHBA-2012-0013.html. Red Hat Enterprise Linux 5 is not affected. The Red Hat Security Response Team has rated this issue as having low security impact. For additional information, refer to the Issue Severity Classification: https://access.redhat.com/security/updates/classification/.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
AV:N/AC:M/Au:N/C:N/I:P/A:N
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (11 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 1.78% (0.01783) | 77.47th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.78% (0.01783) | 75.33th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.20% (0.00203) | 40.41th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.33% (0.00327) | 71.73th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.33% (0.00327) | 70.07th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.33% (0.00327) | 66.19th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.21% (0.01213) | 66.61th | v2 (v2022.01.01) |
| Feb 13, 2023 | 1.21% (0.01213) | 66.13th | v2 (v2022.01.01) |
| Feb 3, 2023 | 1.32% (0.01319) | 70.54th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.21% (0.01213) | 64.21th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.21% (0.01213) | 40.54th | v2 (v2022.01.01) |
References (8)
- http://libvirt.org/git/?p=libvirt.git%3Ba=commitdiff%3Bh=ae1232b298323dd7bef909426e2ebafa6bca9157 x_refsource_CONFIRM
- http://libvirt.org/news-2012.html x_refsource_CONFIRMVendor Advisory
- http://www.ubuntu.com/usn/USN-2867-1 vendor-advisoryx_refsource_UBUNTU
- https://access.redhat.com/security/cve/CVE-2011-4600 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=760442 x_refsource_CONFIRM
- https://bugzilla.redhat.com/show_bug.cgi?id=765964 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2011-4600
- https://www.cve.org/CVERecord?id=CVE-2011-4600
| Link | Providers | Tags |
|---|---|---|
| http://libvirt.org/git/?p=libvirt.git%3Ba=commitdiff%3Bh=ae1232b298323dd7bef909426e2ebafa6bca9157 | x_refsource_CONFIRM | |
| http://libvirt.org/news-2012.html | x_refsource_CONFIRMVendor Advisory | |
| http://www.ubuntu.com/usn/USN-2867-1 | vendor-advisoryx_refsource_UBUNTU | |
| https://access.redhat.com/security/cve/CVE-2011-4600 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=760442 | x_refsource_CONFIRM | |
| https://bugzilla.redhat.com/show_bug.cgi?id=765964 | Issue Tracking | |
| https://nvd.nist.gov/vuln/detail/CVE-2011-4600 | ||
| https://www.cve.org/CVERecord?id=CVE-2011-4600 |
Change history (0)
No recorded changes yet.