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Fencer Intel
critical 10.0

CVE-2012-4505 json

Heap-based buffer overflow in the px_pac_reload function in lib/pac.c in libproxy 0.2.x and 0.3.x allows remote servers to have an unspecif…

published 2012-11-11 13 y ago modified 2026-06-16 4 mo ago also EUVD-2012-4434

cvss
10.0
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.2%
EPSS 3.2% chance of exploitation in 30 days, percentile 88%
public exploits
0
none known

Summary

Heap-based buffer overflow in the px_pac_reload function in lib/pac.c in libproxy 0.2.x and 0.3.x allows remote servers to have an unspecified impact via a crafted Content-Length size in an HTTP response header for a proxy.pac file request, a different vulnerability than CVE-2012-4504.

Patch / fix

  • libproxy Debian 14, Debian 13, Debian 12 0.3.1-5.1

debian advisories DEBIAN-CVE-2012-4505

  • libproxy RHEL 6 0.3.0-3.el6_3
  • libproxy-bin RHEL 6 0.3.0-3.el6_3
  • libproxy-kde RHEL 6 0.3.0-3.el6_3
  • libproxy-gnome RHEL 6 0.3.0-3.el6_3
  • libproxy-mozjs RHEL 6 0.3.0-3.el6_3
  • libproxy-python RHEL 6 0.3.0-3.el6_3
  • libproxy-webkit RHEL 6 0.3.0-3.el6_3

red hat advisories RHSA-2012:1461

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-2012-4505 updated cvss 5.1

libproxy: PAC handling insufficient content length check leading to buffer overflow

  • Red Hat Enterprise Linux Desktop (v. 6) libproxy 0.3.0-3.el6_3, libproxy-bin 0.3.0-3.el6_3, libproxy-kde 0.3.0-3.el6_3, libproxy-gnome 0.3.0-3.el6_3, libproxy-mozjs 0.3.0-3.el6_3, libproxy-python 0.3.0-3.el6_3, +1 more Red Hat Enterprise Linux Desktop Optional (v. 6) libproxy 0.3.0-3.el6_3, libproxy-bin 0.3.0-3.el6_3, libproxy-kde 0.3.0-3.el6_3, libproxy-gnome 0.3.0-3.el6_3, libproxy-mozjs 0.3.0-3.el6_3, libproxy-python 0.3.0-3.el6_3, +1 more Red Hat Enterprise Linux HPC Node Optional (v. 6) libproxy 0.3.0-3.el6_3, libproxy-bin 0.3.0-3.el6_3, libproxy-kde 0.3.0-3.el6_3, libproxy-gnome 0.3.0-3.el6_3, libproxy-mozjs 0.3.0-3.el6_3, libproxy-python 0.3.0-3.el6_3, +1 more Red Hat Enterprise Linux Server (v. 6) libproxy 0.3.0-3.el6_3, libproxy-bin 0.3.0-3.el6_3, libproxy-kde 0.3.0-3.el6_3, libproxy-gnome 0.3.0-3.el6_3, libproxy-mozjs 0.3.0-3.el6_3, libproxy-python 0.3.0-3.el6_3, +1 more Red Hat Enterprise Linux Server Optional (v. 6) libproxy 0.3.0-3.el6_3, libproxy-bin 0.3.0-3.el6_3, libproxy-kde 0.3.0-3.el6_3, libproxy-gnome 0.3.0-3.el6_3, libproxy-mozjs 0.3.0-3.el6_3, libproxy-python 0.3.0-3.el6_3, +1 more Red Hat Enterprise Linux Workstation (v. 6) libproxy 0.3.0-3.el6_3, libproxy-bin 0.3.0-3.el6_3, libproxy-kde 0.3.0-3.el6_3, libproxy-gnome 0.3.0-3.el6_3, libproxy-mozjs 0.3.0-3.el6_3, libproxy-python 0.3.0-3.el6_3, +1 more
    +1 more products
    Red Hat Enterprise Linux Workstation Optional (v. 6) libproxy 0.3.0-3.el6_3, libproxy-bin 0.3.0-3.el6_3, libproxy-kde 0.3.0-3.el6_3, libproxy-gnome 0.3.0-3.el6_3, libproxy-mozjs 0.3.0-3.el6_3, libproxy-python 0.3.0-3.el6_3, +1 more
    fixed: vendor fix RHSA-2012:1461

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

3.22% chance of exploitation in the next 30 days, higher than 88% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 2.0 10.0 AV:N/AC:L/Au:N/C:C/I:C/A:C

Classification

Weakness
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

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.