What is CVE-2012-1539?

CVE-2012-1539 is a high-severity vulnerability in Microsoft Internet Explorer, classified under CWE-399. CVSS score: 8.1/10. Published 2012-11-14.

How severe is CVE-2012-1539?

High severity. CVSS v3 base score is 8.1 out of 10.

Use After Free in Microsoft Internet Explorer

CVE-2012-1539

Use-after-free vulnerability in Microsoft Internet Explorer 9 allows remote attackers to execute arbitrary code via a crafted web site, aka "CTreePos Use After Free Vulnerability."

Published 2012-11-14 · last modified 2026-06-16.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.254 (97.9th percentile), scored 2026-10-04.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 98th percentile — 97.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.254 · newest: 0.254 · change: 0.000

Affected products

Microsoft Internet Explorer — versions 9
Microsoft Windows 7
Microsoft Windows Server 2008
Microsoft Windows Vista

Weakness classification (CWE)

References

oval.cisecurity.org/repository/search/definition/oval:org.mitre.oval:def:15886 (signature, vdb-entry)
www.securitytracker.com/id (vdb-entry)
docs.microsoft.com/en-us/security-updates/securitybulletins/2012/ms12-071 (vendor-advisory)
www.securityfocus.com/bid/56421 (vdb-entry)
secunia.com/advisories/51202 (third-party-advisory)
www.us-cert.gov/cas/techalerts/TA12-318A.html (US Government Resource, third-party-advisory)

Frequently asked questions

What is CVE-2012-1539?: CVE-2012-1539 is a high-severity vulnerability in Microsoft Internet Explorer, classified under CWE-399. CVSS score: 8.1/10. Published 2012-11-14.
How severe is CVE-2012-1539?: High severity. CVSS v3 base score is 8.1 out of 10.