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Fencer Intel
high 7.8

CVE-2011-2520 json

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 a…

published 2011-07-21 15 y ago modified 2026-06-16 4 mo ago also EUVD-2011-2505

cvss
7.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 36%
public exploits
0
none known

Summary

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.

Patch / fix

  • system-config-firewall RHEL 6 1.2.27-3.el6_1.3
  • system-config-printer RHEL 6 1.1.16-17.el6_1.2
  • system-config-firewall-tui RHEL 6 1.2.27-3.el6_1.3
  • system-config-printer-libs RHEL 6 1.1.16-17.el6_1.2
  • system-config-printer-udev RHEL 6 1.1.16-17.el6_1.2
  • system-config-firewall-base RHEL 6 1.2.27-3.el6_1.3

red hat advisories RHSA-2011:0953

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-2011-2520 updated cvss 6.0

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

  • Red Hat Enterprise Linux Server (v. 6) system-config-firewall 1.2.27-3.el6_1.3, system-config-printer 1.1.16-17.el6_1.2, system-config-firewall-tui 1.2.27-3.el6_1.3, system-config-firewall-base 1.2.27-3.el6_1.3, system-config-printer-libs 1.1.16-17.el6_1.2, system-config-printer-udev 1.1.16-17.el6_1.2
    fixed: vendor fix RHSA-2011:0953

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

0.42% chance of exploitation in the next 30 days, higher than 36% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 6.0 AV:L/AC:H/Au:S/C:C/I:C/A:C

Classification

Weakness
  • CWE-502 Deserialization of Untrusted Data

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.