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CVE-2012-4512: 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…

HighCVSS 8.8 · v3.1—Proof of concept Fix available

Noroxi assessment

Priority: Monitor (action score 38/100)

  • Public proof-of-concept code exists (Exploit-DB); there is no record of exploitation in the wild.
  • Probability of exploitation in the next 30 days: 11.6% (FIRST EPSS); higher than 96.1% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. A user must open a link or visit a page. No special conditions are required; it is repeatable.
  • Fixed version: kdelibs (Red Hat:enterprise_linux:6::client) 6:4.3.4-14.el6_3.2; kdelibs-apidocs (Red Hat:enterprise_linux:6::client) 6:4.3.4-14.el6_3.2; kdelibs-common (Red Hat:enterprise_linux:6::client) 6:4.3.4-14.el6_3.2.

Low priority for now. Upgrade to kdelibs (Red Hat:enterprise_linux:6::client) 6:4.3.4-14.el6_3.2; kdelibs-apidocs (Red Hat:enterprise_linux:6::client) 6:4.3.4-14.el6_3.2; kdelibs-common (Red Hat:enterprise_linux:6::client) 6:4.3.4-14.el6_3.2 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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
Feb 8, 2020
Updated
Jun 16, 2026
EPSS
11.6% · 96th percentile

Report tools

JSON

Action score

38

Monitor

Low priority for now.

CVSS
35 / 40 · 8.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
3 / 30 · 11.6%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • Proof of concept exists, no weaponized module
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2012-4512

When you'll hear from us

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  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
kdekde
redhatenterprise linux
redhatenterprise linux desktop
redhatenterprise linux server eus
redhatenterprise linux workstation

Versions reported by the vendor

Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.

  • KDE Konqueror

    • 4.7.3affected
Affected versions · NVD (5)

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • kde kde4.7.3
  • redhat enterprise linux6.0
  • redhat enterprise linux desktop6.0
  • redhat enterprise linux server eus6.3
  • redhat enterprise linux workstation6.0

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Red Hat:enterprise_linux:6::clientkdelibsbefore 6:4.3.4-14.el6_3.26:4.3.4-14.el6_3.2
Red Hat:enterprise_linux:6::clientkdelibs-apidocsbefore 6:4.3.4-14.el6_3.26:4.3.4-14.el6_3.2
Red Hat:enterprise_linux:6::clientkdelibs-commonbefore 6:4.3.4-14.el6_3.26:4.3.4-14.el6_3.2
Red Hat:enterprise_linux:6::clientkdelibs-debuginfobefore 6:4.3.4-14.el6_3.26:4.3.4-14.el6_3.2
Red Hat:enterprise_linux:6::clientkdelibs-develbefore 6:4.3.4-14.el6_3.26:4.3.4-14.el6_3.2

Same product

kde: all records

Other highest-scoring records for the same primary product.

  • CVE-2005-0011Multiple vulnerabilities in fliccd, when installed setuid root as part of the kdeedu Kstars support for Instrument Neutral Distributed…
    41Plan
  • CVE-2003-0690KDM in KDE 3.1.3 and earlier does not verify whether the pam_setcred function call succeeds, which may allow attackers to gain root…
    41Plan
  • CVE-2008-1670Heap-based buffer overflow in the progressive PNG Image loader (decoders/pngloader.cpp) in KHTML in KDE 4.0.x up to 4.0.3 allows remote…
    38Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2012-4513Nov 11, 2012 · khtml/imload/scaledimageplane.h in Konqueror in KDE 4.7.3 allows remote attackers to cause a denial of service (crash) and possibly read…
    29Monitor
  • ← EarlierCVE-2012-4514Nov 11, 2012 · rendering/render_replaced.cpp in Konqueror in KDE before 4.9.3 allows remote attackers to cause a denial of service (NULL pointer…
    23Monitor
  • ← EarlierCVE-2012-4515Nov 11, 2012 · Use-after-free vulnerability in khtml/rendering/render_replaced.cpp in Konqueror in KDE 4.7.3, when the context menu is shown, allows…
    29Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
red hat:kdelibs6:4.3.4-14.el6_3.2 · Red Hat:enterprise_linux:6::clientPackage registry (OSV)
red hat:kdelibs-apidocs6:4.3.4-14.el6_3.2 · Red Hat:enterprise_linux:6::clientPackage registry (OSV)
red hat:kdelibs-common6:4.3.4-14.el6_3.2 · Red Hat:enterprise_linux:6::clientPackage registry (OSV)
red hat:kdelibs-debuginfo6:4.3.4-14.el6_3.2 · Red Hat:enterprise_linux:6::clientPackage registry (OSV)
red hat:kdelibs-devel6:4.3.4-14.el6_3.2 · Red Hat:enterprise_linux:6::clientPackage registry (OSV)

Exploit status

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

  • Exploit-DB entry ×1

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Exploit-DB entrydos2012-11-01

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. First PoC-2656 d
  2. Published
  3. TodayNov 15, 2026+2472 d

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • A user must open a link or visit a page.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-843 · Access of Resource Using Incompatible Type ('Type Confusion')

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

References

Show all references (9 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records