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Fencer Intel
high 8.8

CVE-2012-4512 in the critical feed json

The CSS parser (khtml/css/cssparser.cpp) in Konqueror in KDE 4.7.3 allows remote attackers to cause a denial of service (crash) and possibl…

published 2020-02-08 6 y ago modified 2026-06-16 4 mo ago also EUVD-2012-4441

cvss
8.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
11.7%
EPSS 11.7% chance of exploitation in 30 days, percentile 96%
public exploits
1
Exploit-DB

Summary

The CSS parser (khtml/css/cssparser.cpp) in Konqueror in KDE 4.7.3 allows remote attackers to cause a denial of service (crash) and possibly read memory via a crafted font face source, related to "type confusion."

Patch / fix

  • kdelibs RHEL 6 6:4.3.4-14.el6_3.2
  • kdelibs-common RHEL 6 6:4.3.4-14.el6_3.2
  • kdelibs-apidocs RHEL 6 6:4.3.4-14.el6_3.2

red hat advisories RHSA-2012:1416

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-2012-4512 updated cvss 6.8

kdelibs: Heap-based buffer overflow when parsing location of a font face source

  • Red Hat Enterprise Linux Desktop (v. 6) kdelibs 4.3.4-14.el6_3.2, kdelibs-common 4.3.4-14.el6_3.2 Red Hat Enterprise Linux Desktop Optional (v. 6) kdelibs 4.3.4-14.el6_3.2, kdelibs-apidocs 4.3.4-14.el6_3.2
    fixed: vendor fix RHSA-2012:1416
  • Red Hat Enterprise Linux HPC Node (v. 6)
    fixed: vendor fix RHSA-2012:1418
  • Red Hat Enterprise Linux HPC Node Optional (v. 6) kdelibs 4.3.4-14.el6_3.2, kdelibs-common 4.3.4-14.el6_3.2, kdelibs-apidocs 4.3.4-14.el6_3.2 Red Hat Enterprise Linux Server (v. 6) kdelibs 4.3.4-14.el6_3.2, kdelibs-common 4.3.4-14.el6_3.2, kdelibs-apidocs 4.3.4-14.el6_3.2 Red Hat Enterprise Linux Workstation (v. 6) kdelibs 4.3.4-14.el6_3.2, kdelibs-common 4.3.4-14.el6_3.2, kdelibs-apidocs 4.3.4-14.el6_3.2
    fixed: vendor fix RHSA-2012:1416
  • Red Hat Enterprise Linux 5 kdelibs
    not affected: vulnerable code not present

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

Timeline

  1. First public exploit (EDB-22406)
  2. Published

Exploit prediction

11.66% chance of exploitation in the next 30 days, higher than 96% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • EDB-22406 Konqueror 4.7.3 - Memory Corruption dos, 2012-11-01
  • em386.blogspot.com http://em386.blogspot.com/2010/12/webkit-css-type-confusion.html referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P

Affected products

  • KDE Konqueror

Classification

Weakness
  • CWE-843 Access of Resource Using Incompatible Type

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.