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Vulnerability record · CVE-2009-1920 · published 8 September 2009

CVE-2009-1920: Microsoft windows 2000 code injection vulnerability

Microsoft · Windows 2000

The JScript scripting engine 5.1, 5.6, 5.7, and 5.8 in JScript.dll in Microsoft Windows, as used in Internet Explorer, does not properly load decoded scripts into memory before execution, which allows remote attackers to execute arbitrary code via a crafted web site that triggers memory corruption, aka "JScript Remote Code Execution Vulnerability."

9.3 CVSS 2.0 High EPSS 22% · top 2.5% CWE-94 · Code injection
9.3CVSS 2.0 base score
22%EPSS exploitation probability, 30 days
NoNot in CISA KEV
5Affected product versions listed by NVD
6References
16 Jun 2026Last modified by NVD

Description

The JScript scripting engine 5.1, 5.6, 5.7, and 5.8 in JScript.dll in Microsoft Windows, as used in Internet Explorer, does not properly load decoded scripts into memory before execution, which allows remote attackers to execute arbitrary code via a crafted web site that triggers memory corruption, aka "JScript Remote Code Execution Vulnerability."

AV:N/AC:M/Au:N/C:C/I:C/A:C

Affected products

5 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.us-cert.gov/cas/techalerts/TA09-251A.html US Government Resource
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-045
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6316
http://www.us-cert.gov/cas/techalerts/TA09-251A.html US Government Resource
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-045
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6316

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2009-1920), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.