CVE-2012-4512

Exp

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."

Published: 2020-02-08 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2012-4512 is rated High Exploit Risk (85.3/100): CVSS High severity, with high exploitation likelihood (EPSS 11.66%, 95th percentile). 2 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +1.68% over the last day, indicating growing attacker interest. Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2012-4512

EDB-ID Source Kind Published Link
22406 exploit_db edb 2012-11-01 Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2012-4512

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 9.98% 11.66% +1.68%
2 2026-04-23 11.50% 9.98% -1.52%
3 2026-02-16 — 11.50% —

Full EPSS history (13 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2012-4512

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.8 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 5.9 [email protected]
6.8 2.0 MEDIUM
AV:N/AC:M/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 8.6 6.4 [email protected]

Weakness enumeration for CVE-2012-4512

OS Trackers for CVE-2012-4512

vendor priority summary link
gentoo normal CVE-2012-4512: 1 GLSA(s) (201406-31), 1 atom(s) (kde-base/konqueror); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2012-4512
redhat critical — https://access.redhat.com/security/cve/CVE-2012-4512
ubuntu low CVE-2012-4512 low priority: Ubuntu including 2 source packages (kde-baseapps, kdebase), 32 status rows across 16 suites (hardy, lucid, natty, oneiric, precise, quantal, raring, saucy, trusty, upstream, utopic, vivid, wily, xenial, yakkety, zesty): DNE 16, ignored 12, not-affected 2, released 2. https://ubuntu.com/security/CVE-2012-4512

Affected software / configurations for CVE-2012-4512

Vendor Product Version Raw CPE
kde kde 4.7.3 cpe:2.3:a:kde:kde:4.7.3:*:*:*:*:*:*:*
redhat enterprise_linux 6.0 cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:*
redhat enterprise_linux_desktop 6.0 cpe:2.3:o:redhat:enterprise_linux_desktop:6.0:*:*:*:*:*:*:*
redhat enterprise_linux_server_eus 6.3 cpe:2.3:o:redhat:enterprise_linux_server_eus:6.3:*:*:*:*:*:*:*
redhat enterprise_linux_workstation 6.0 cpe:2.3:o:redhat:enterprise_linux_workstation:6.0:*:*:*:*:*:*:*

References for CVE-2012-4512

URL Tags
http://archives.neohapsis.com/archives/bugtraq/2012-11/0005.html Broken Link Third Party Advisory
http://em386.blogspot.com/2010/12/webkit-css-type-confusion.html Exploit Third Party Advisory
http://quickgit.kde.org/index.php?p=kdelibs.git&a=commitdiff&h=a872c8a969a8bd3706253d6ba24088e4f07f3352 Broken Link Vendor Advisory
http://rhn.redhat.com/errata/RHSA-2012-1416.html Third Party Advisory
http://rhn.redhat.com/errata/RHSA-2012-1418.html Third Party Advisory
http://secunia.com/advisories/51097 Not Applicable Third Party Advisory
http://secunia.com/advisories/51145 Not Applicable Third Party Advisory
http://www.nth-dimension.org.uk/pub/NDSA20121010.txt.asc Third Party Advisory
http://www.openwall.com/lists/oss-security/2012/10/11/11 Mailing List Third Party Advisory
http://www.openwall.com/lists/oss-security/2012/10/30/6 Mailing List Third Party Advisory
http://www.securitytracker.com/id?1027709 Third Party Advisory VDB Entry
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