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CVE-2011-2520

24
FAUCET Score

CVE-2011-2520 describes a critical vulnerability in system-config-firewall versions 1.2.29 and earlier, affecting Fedora and Red Hat distributions. This flaw stems from the unsafe use of the Python pickle module during D-Bus communication, potentially allowing local users to achieve privilege escalation through crafted serialized objects. With a CVSS score of 7.8 (High), the vulnerability has a low attack complexity and requires local access, but successful exploitation could lead to full compromise of confidentiality, integrity, and availability. There is no known active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 1.2.29CPE matchmatch criteria
cpe:2.3:a:redhat:system-config-firewall:*:*:*:*:*:*:*:*
15CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:15:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.8HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
1.8
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.42%
Probability of exploitation in next 30 days
EPSS Percentile
34.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0042 is in the 75th percentile among its peer group of 17,070 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 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 (2)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: system-config-firewall-0:1.2.27-3.el6_1.3
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: system-config-printer-0:1.1.16-17.el6_1.2
View patch

Vendor Advisories (1)

redhatCVE-2011-2520Moderate

system-config-firewall: privilege escalation flaw via use of python pickle

Jul 18, 2011

References

lists.fedoraproject.org / pipermail/package-announce/2011-August/063314.html
Mailing List
bugzilla.redhat.com / show_bug.cgi
Issue Tracking
secunia.com / advisories/45294
Not Applicable
securitytracker.com / id
Broken Link
exchange.xforce.ibmcloud.com / vulnerabilities/68734
Third Party AdvisoryVDB Entry
openwall.com / lists/oss-security/2011/07/18/6
Mailing List
redhat.com / support/errata/RHSA-2011-0953.html
Not Applicable
securityfocus.com / bid/48715
Broken Link