CVE-2012-4512Public exploitNetwork attack vector

Crash and memory disclosure via CSS type confusion

Published Feb 8, 2020 · Updated Aug 6, 2024

Type confusion in Konqueror 4.7.3's KHTML CSS parser allows remote attackers to crash the browser or read process memory via crafted CSS. In khtml/css/cssparser.cpp, font-face source handling treats format() and local() values as an incompatible internal type, corrupting memory. Exploitation requires a user to open attacker-controlled web content; the bounded results are process termination and disclosure of memory visible to the browser.

CVSS severity8.8
High
EPSS probability11.66%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Type confusion in Konqueror 4.7.3's KHTML CSS parser allows remote attackers to crash the browser or read process memory via crafted CSS. In khtml/css/cssparser.cpp, font-face source handling treats format() and local() values as an incompatible internal type, corrupting memory. Exploitation requires a user to open attacker-controlled web content; the bounded results are process termination and disclosure of memory visible to the browser.

The record

CVE
CVE-2012-4512
Published
Feb 8, 2020
Updated
Aug 6, 2024
Vendor
KDE
Product
Konqueror
Classifications
CWE-843, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 8, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 6, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.7.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

KDE · Konquerorversion=4.7.3

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-843Access of Resource Using Incompatible Type ('Type Confusion')
T1204.001User Execution: Malicious Link

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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