Is CVE-2012-1539 in the CISA KEV catalog?

No. CVE-2012-1539 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2012-1539?

CVE-2012-1539 has a CVSS v3 base score of 8.1 (HIGH).

What is the EPSS score for CVE-2012-1539?

CVE-2012-1539 has an EPSS score of 25.37% (98th percentile), estimating the probability of exploitation in the next 30 days.

CVE & CISA-KEV Catalog

CVE-2012-1539

HIGHEPSS 98th pctl

8.1

CVSS v3

NVD

Description

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."

CWE-399 CWE-416Use After Free

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

25.37%probability of exploitation in 30 days

98thpercentile

Very high risk: more likely to be exploited than 98% of all known CVEs.

References

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-29.