CVE-2013-3893KEV · OVERDUE

Microsoft Internet Explorer Resource Management Errors Vulnerability

High · published September 18, 2013

Patch now

Confirmed exploited, and the score agrees

CVSS calls it high at 8.8. It is confirmed in active exploitation. It sits in the 99.8th percentile for exploit probability.

415
days past CISA
deadline
CVSS v3.1
8.8
EPSS
88%
Percentile
99.8
In the wild
Confirmed
What it is

🚨 A sneaky use-after-free vulnerability lurks in mshtml.dll, allowing attackers to execute arbitrary code with just a crafted JavaScript string! ⚡ Think of it like a hotel that forgets to remove a guest's key after they check out — anyone can waltz back in and do as they please! 🏨 If an attacker exploits this vulnerability, they could run any code they desire on the victim's system, potentially gaining full control over it. It’s not just a minor annoyance; it could lead to data theft or even further breaches into the network!

Put simply

Think of it like a hotel that forgets to remove a guest's key after they check out — anyone can waltz back in and do as they please! 🏨 This use-after-free vulnerability arises in the SetMouseCapture functionality of Internet Explorer, allowing attackers to manipulate memory in a way that can execute malicious scripts when the browser processes certain URLs.

What to do

If an attacker exploits this vulnerability, they could run any code they desire on the victim's system, potentially gaining full control over it. It’s not just a minor annoyance; it could lead to data theft or even further breaches into the network! Immediate action is needed! Upgrade to a supported version of Internet Explorer or switch to safer alternatives. Additionally, ensure that your organization's security policies restrict the use of outdated browsers. 🛡️ You've got this! By following these steps, you can safeguard your systems and help keep the internet safe for everyone! 💪😄

The record
Technical detail
CVSS v3.1
8.8 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.87526 · 99.8th percentile
Published
2013-09-18T10:00Z
KEV added
2025-08-12 · due 2025-09-02
EPSS history
Timeline
  • 12 AUG 00:00Z
    Added to CISA KEV — remediate by Sep 2
    kev
  • 18 SEP 10:00Z
    Use-after-free vulnerability in the SetMouseCapture implementation in mshtml.dll in Microsoft Internet Explorer 6 through 11 allows remote attackers to execute…
    cvelistv5