CVE-2012-4513: khtml/imload/scaledimageplane.h in Konqueror in KDE 4.7.3 allows remote attackers to cause a denial of service

This week

MEDIUM 6.4MITIGATE

CVE-2012-4513 is a medium-severity flaw (CVSS 6.4) affecting kde. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

khtml/imload/scaledimageplane.h in Konqueror in KDE 4.7.3 allows remote attackers to cause a denial of service (crash) and possibly read memory via large canvas dimensions, which leads to an unexpected sign extension and a heap-based buffer over-read.

Why this priority

EPSS top 4%: very likely to be exploited
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.4 (Medium)
EPSS exploit chance	12.6% (top 4%)
CISA exploited list	No
Weakness	CWE-119
Published	2012-11-11
Last modified	2026-06-16

Publisher (CNA): Red Hat, Inc. · Vendor: kde

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2012-11-11 13:00 UTCPublished CVE record published
2026-06-16 23:45 UTCUpdated Record last modified

kde kde MITIGATE

Affected: 4.7.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.7.3

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: Konqueror 4.7.3 - Memory Corruption

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2012-4513?

kde: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2012-4513 being exploited?

CVE-2012-4513 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2012-4513 affect?

CVE-2012-4513 affects kde. Severity is medium (CVSS 6.4). khtml/imload/scaledimageplane.h in Konqueror in KDE 4.7.3 allows remote attackers to cause a denial of service (crash) and possibly read memory via large canvas dimensions, which leads to an unexpected sign extension and a heap-based buffer

How urgent is CVE-2012-4513?

Priority 51/100. EPSS top 4%: very likely to be exploited; Public exploit reference

Related CVEs

CVE-2012-4515 MEDIUM 6.8 MITIGATE Use-after-free vulnerability in khtml/rendering/render_replaced.cpp in Konqueror in KDE 4.7.3, when the contex
CVE-2012-4514 MEDIUM 5.0 UPGRADE rendering/render_replaced.cpp in Konqueror in KDE before 4.9.3 allows remote attackers to cause a denial of se
CVE-2012-4512 HIGH 8.8 DOWNGRADE MITIGATE The CSS parser (khtml/css/cssparser.cpp) in Konqueror in KDE 4.7.3 allows remote attackers to cause a denial o
CVE-2008-1671 MEDIUM 4.6 MITIGATE start_kdeinit in KDE 3.5.5 through 3.5.9, when installed setuid root, allows local users to cause a denial of
CVE-2008-1670 HIGH 9.3 MITIGATE Heap-based buffer overflow in the progressive PNG Image loader (decoders/pngloader.cpp) in KHTML in KDE 4.0.x

References

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