CVE-2012-4969KEV · OVERDUE

Microsoft Internet Explorer Use-After-Free Vulnerability

High · published September 18, 2012

Patch now

Confirmed exploited, and the score agrees

CVSS calls it high at 8.1. It is confirmed in active exploitation. It sits in the 99.6th percentile for exploit probability.

1583
days past CISA
deadline
CVSS v3.1
8.1
EPSS
80%
Percentile
99.6
In the wild
Confirmed
What it is

🚨 A devious use-after-free vulnerability in Internet Explorer could let attackers run wild with just a malicious website! ⚡ Think of it like an overzealous chef who forgets to remove a dish from the oven, only to have a sneaky guest swoop in and change the whole recipe while they’re distracted. This vulnerability allows attackers to exploit the oversight and execute their own code without permission. This could mean anything from stealing sensitive information to taking full control of the affected machine! A successful attack could wreak absolute havoc, making this a high-stakes game for anyone still using these older versions of Internet Explorer.

Put simply

Think of it like an overzealous chef who forgets to remove a dish from the oven, only to have a sneaky guest swoop in and change the whole recipe while they’re distracted. This vulnerability allows attackers to exploit the oversight and execute their own code without permission. The flaw resides in the CMshtmlEd::Exec function within mshtml.dll, which fails to properly manage memory, leading to a use-after-free scenario. This vulnerability allows remote attackers to execute arbitrary code through specially crafted web content.

What to do

This could mean anything from stealing sensitive information to taking full control of the affected machine! A successful attack could wreak absolute havoc, making this a high-stakes game for anyone still using these older versions of Internet Explorer. To protect yourself, immediately upgrade your Internet Explorer to a newer version or switch to a more secure browser. Additionally, ensure that all security patches are applied and consider implementing a web filtering solution to block malicious sites. You've got this! Stay safe and proactive, and you can outsmart these vulnerabilities! 🛡️

The record
Technical detail
CVSS v3.1
8.1 · HIGH
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.80250 · 99.6th percentile
Published
2012-09-18T10:00Z
KEV added
2022-06-08 · due 2022-06-22
EPSS history
Timeline
  • 08 JUN 00:00Z
    Added to CISA KEV — remediate by Jun 22
    kev
  • 18 SEP 10:00Z
    Use-after-free vulnerability in the CMshtmlEd::Exec function in mshtml.dll in Microsoft Internet Explorer 6 through 9 allows remote attackers to execute…
    cvelistv5