CVE-2012-4787

9.0 CRITICAL 18% exploit odds No fix listed Memory safety Browser & mail

What it is

Use-after-free vulnerability in Microsoft Internet Explorer 9 and 10 allows remote attackers to execute arbitrary code via a crafted web site that triggers access to an object that (1) was not properly initialized or (2) is deleted, aka "Improper Ref Counting Use After Free Vulnerability."

At a glance

Exploitability: Can be exploited over the network without logging in. High risk of data exposure, data tampering, service disruption.
Exploit odds: 17.6% chance of exploitation in the next 30 days (EPSS). Higher than most.
Fix: No patch or advisory is linked yet. Look at mitigations or restrict exposure.

Timeline

2012-12-12 00:55 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-16 23:45 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 17.6% in the next 30 days (EPSS).
Severity: 9.0 CRITICAL (CVSS).
Fix: none linked yet, which raises it.

Details

Published: 2012-12-12 00:55 UTC
Last modified: 2026-06-16 23:45 UTC
Exploit probability: 17.6% · EPSS, next 30 days
Weakness: CWE-399
Record status: Modified

Affected

Microsoft Internet Explorer 9
Microsoft Internet Explorer 10

Attack profile CVSS 3.1 · 9.0

Attack vector: Network
Complexity: High
Privileges needed: None
User interaction: None
Scope: Changed
Confidentiality: High
Integrity: High
Availability: High

Raw vector

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

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2012-4787.md and follow it. Check whether this project is affected by CVE-2012-4787. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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References

NVD record · CVE.org record