CVE-2011-1998

Name: CVE-2011-1998
Creator: NVD / NIST
Published: 2011-10-12T02:52:43.677+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 21.23%

Last modified Jun 16, 2026

CVE-2011-1998 is a vulnerability of currently unknown severity. 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.". EPSS estimates a 21.23% chance of exploitation in the next 30 days.

Description

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."

Metrics

EPSS Probability

21.23%

97.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-908

Affected Software

Vendor	Product	Versions
Microsoft	Internet Explorer	9

References

http://www.securityfocus.com/bid/49963Broken Link, Third Party Advisory, VDB Entry
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-081Patch, Vendor Advisory
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A13199Tool Signature
http://www.securityfocus.com/bid/49963Broken Link, Third Party Advisory, VDB Entry
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-081Patch, Vendor Advisory
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A13199Tool Signature

Timeline

Published: Oct 12, 2011
Last Modified: Jun 16, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2011-1998?

How severe is CVE-2011-1998?

Severity scoring for CVE-2011-1998 is pending analysis. The EPSS model estimates a 21.23% probability of exploitation in the next 30 days.

How do I fix CVE-2011-1998?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2011-1998?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST