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."
Conclusion & alert: CVE-2012-2523 is rated High Risk (66.3/100): CVSS Critical severity, with high exploitation likelihood (EPSS 22.18%, 97th percentile). Core evidence: EPSS ranks this CVE among the most likely to be exploited in the near term. Mandatory action: High exploitation likelihood—assess exposure and prioritize remediation.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-06-15 | 64.66% | 22.18% | -42.48% |
| 2 | 2025-03-30 | 75.75% | 64.66% | -11.08% |
| 3 | 2025-03-29 | — | 75.75% | — |
Full EPSS history (15 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 9.3 | 2.0 | HIGH |
|
8.6 | 10.0 | [email protected] |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| microsoft | internet_explorer | 8 | cpe:2.3:a:microsoft:internet_explorer:8:*:*:*:*:*:*:* |
| microsoft | internet_explorer | 9 | cpe:2.3:a:microsoft:internet_explorer:9:*:*:*:*:*:*:* |
| microsoft | jscript | 5.8 | cpe:2.3:a:microsoft:jscript:5.8:*:*:*:*:*:*:* |
| microsoft | vbscript | 5.8 | cpe:2.3:a:microsoft:vbscript:5.8:-:x64:*:*:*:*:* |