CVE-2011-2520

fw_dbus.py in system-config-firewall 1.2.29 and earlier uses the pickle Python module unsafely...

7.8 HighFix available

fw_dbus.py in system-config-firewall 1.2.29 and earlier uses the pickle Python module unsafely during D-Bus communication between the GUI and the backend, which might allow local users to gain privileges via a crafted serialized object.

Attack profile

How easy it is to exploit

Attack vector: Local
Complexity: Low
Privileges needed: Low
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

0.42%Down 0.7 points since Feb 4, 2022

What each source reports

NVD Score used 7.8

Record: CVE-2011-2520
CVSS 3.1: 7.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0: 6.0 MediumAV:L/AC:H/Au:S/C:C/I:C/A:C
Weakness: CWE-502
Updated: 2026-11-02

CVE List No score

Record: CVE-2011-2520
Updated: 2026-11-02

EUVDEUVD-2011-2505 No score

Record: EUVD-2011-2505
Updated: 2026-11-03

GitHub AdvisoriesGHSA-j359-qhq6-r897 7.8

fw_dbus.py in system-config-firewall 1.2.29 and earlier uses the pickle Python module unsafely...

Record: GHSA-j359-qhq6-r897
CVSS 3.1: 7.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-502
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`system-config-firewall` Red Hat:enterprise_linux:6::server	before 0:1.2.27-3.el6_1.3	0:1.2.27-3.el6_1.3
`system-config-firewall-base` Red Hat:enterprise_linux:6::server	before 0:1.2.27-3.el6_1.3	0:1.2.27-3.el6_1.3
`system-config-firewall-tui` Red Hat:enterprise_linux:6::server	before 0:1.2.27-3.el6_1.3	0:1.2.27-3.el6_1.3
`system-config-printer` Red Hat:enterprise_linux:6::server	before 0:1.1.16-17.el6_1.2	0:1.1.16-17.el6_1.2
`system-config-printer-debuginfo` Red Hat:enterprise_linux:6::server	before 0:1.1.16-17.el6_1.2	0:1.1.16-17.el6_1.2
`system-config-printer-libs` Red Hat:enterprise_linux:6::server	before 0:1.1.16-17.el6_1.2	0:1.1.16-17.el6_1.2
`system-config-printer-udev` Red Hat:enterprise_linux:6::server	before 0:1.1.16-17.el6_1.2	0:1.1.16-17.el6_1.2

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2011-2520 is a high vulnerability (CVSS 7.8) in Redhat System-config-firewall, published July 21, 2011. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.42%, the 36th percentile. Fixed in system-config-firewall 0:1.2.27-3.el6_1.3.

References

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