What’s Vulnerable › Vulnerabilities

CVE-2009-1920

• Severity: critical (CVSS 9.3 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 21.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2009-09-08 · updated 2026-06-16
• Weakness: CWE-94

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."

Affected products

• Microsoft Windows 2000: all versions
• Microsoft Windows Server 2003: all versions
• Microsoft Windows Server 2008: all versions
• Microsoft Windows Vista: all versions
• Microsoft Windows XP Service Pack 3: all versions

References

• http://www.us-cert.gov/cas/techalerts/TA09-251A.html
• 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
• 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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