What’s Vulnerable › Vulnerabilities

CVE-2012-2523

• Severity: critical (CVSS 9.3 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 22.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2012-08-15 · updated 2026-06-16
• Weakness: CWE-189

Description

Integer overflow in Microsoft Internet Explorer 8 and 9, JScript 5.8, and VBScript 5.8 on 64-bit platforms allows remote attackers to execute arbitrary code by leveraging an incorrect size calculation during object copying, aka "JavaScript Integer Overflow Remote Code Execution Vulnerability."

Affected products

• Microsoft Internet Explorer 11: 8, 9
• Microsoft Jscript: 5.8
• Microsoft Vbscript: 5.8

References

• http://www.us-cert.gov/cas/techalerts/TA12-227A.html
• https://docs.microsoft.com/en-us/security-updates/securitybulletins/2012/ms12-052
• https://docs.microsoft.com/en-us/security-updates/securitybulletins/2012/ms12-056
• https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A15790
• http://www.us-cert.gov/cas/techalerts/TA12-227A.html
• https://docs.microsoft.com/en-us/security-updates/securitybulletins/2012/ms12-052
• https://docs.microsoft.com/en-us/security-updates/securitybulletins/2012/ms12-056
• https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A15790

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