No exploitation reported

CVE-2012-4787

No exploitation reported by the sources we read.

Published2012-12-12
WeaknessCWE-399 · CWE-416

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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."

Timeline

dates in UTC

2012-12-1200:55CVE publishedNVD
2026-10-2319:23EPSS crossed 10 %FIRST EPSS

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2012-4787?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2012-4787?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Microsoft internet explorerversion to verify

Branch	Affected	Fixed in	Source
9.x	= 9	no fix published	NVD
10.x	= 10	no fix published	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

No fix published by the sources we read yet. NVD record

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

CISA-ADPSSVC decisionnone2024-01-10
OpenCVESSVC decisionnone—
CISA-ADPCVSS 3.192024-10-17
NVDCVSS 2.09.3read 2026-10-23
CISA-ADPweakness (CWE)CWE-4162024-10-17
NVDweakness (CWE)CWE-399read 2026-10-23
FIRST EPSSEPSS score17.6 %read 2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Published: 2012-12-12
Last Modified: 2026-06-16
NVD status: Modified

Frequently asked questions

What is CVE-2012-4787?

Is CVE-2012-4787 actively exploited?

Active exploitation of CVE-2012-4787 has not been confirmed. Its EPSS score was 17.6% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2012-4787?

CVE-2012-4787 has a CVSS v3 base score of 9 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H.

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