Is CVE-2011-1998 being actively exploited?

CVE-2011-1998 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2011-1998?

CVE-2011-1998 has a CVSS 2.0 base score of 9.3 (HIGH).

CVE-2011-1998

HIGH · CVSS 9.3EPSS 21.2%EU EUVD

Microsoft Internet Explorer 9 does not properly handle objects in memory, which allows remote attackers to execute arbitrary code by accessing an object that was not properly initialized, aka "Jscript9.dll Remote Code Execution Vulnerability."

Key facts

CVSS score: 9.3 (v2.0)
Severity: HIGH
CVSS vector: AV:N/AC:M/Au:N/C:C/I:C/A:C
Weakness (CWE): CWE-908
EPSS score: 21.2% (98th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2011-1992)
Published: October 12, 2011
NVD last modified: June 16, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2011-1992 in the EU Vulnerability Database. Last updated in EUVD on August 6, 2024.

View on the EU Vulnerability Database

Affected products

microsoft / internet explorer
microsoft / windows 7
microsoft / windows 7
microsoft / windows server 2008
microsoft / windows server 2008
microsoft / windows server 2008
microsoft / windows vista

References

http://www.securityfocus.com/bid/49963(Broken Link, Third Party Advisory, VDB Entry)
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-081(Patch, Vendor Advisory)
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A13199(Tool Signature)

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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