Integer signedness error in the SQLConnectW function in an ODBC API (odbc32.dll) in Microsoft Data Access Components (MDAC) 2.8 SP1 and SP2, and Windows Data Access Components (WDAC) 6.0, allows remote attackers to execute arbitrary code via a long string in the Data Source Name (DSN) and a crafted szDSN argument, which bypasses a signed comparison and leads to a buffer overflow, aka "DSN Overflow Vulnerability."
Conclusion & alert: CVE-2011-0026 is rated High Risk (75/100): CVSS Critical severity, with high exploitation likelihood (EPSS 64.30%, 98th percentile). Core evidence: EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +3.32% over the last day, indicating growing attacker interest. 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 | 2025-12-28 | 60.97% | 64.30% | +3.32% |
| 2 | 2025-12-27 | 64.30% | 60.97% | -3.32% |
| 3 | 2025-10-28 | — | 64.30% | — |
Full EPSS history (16 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 | data_access_components | 2.8 | cpe:2.3:a:microsoft:data_access_components:2.8:sp1:*:*:*:*:*:* |
| microsoft | data_access_components | 2.8 | cpe:2.3:a:microsoft:data_access_components:2.8:sp2:*:*:*:*:*:* |
| microsoft | windows_data_access_components | 6.0 | cpe:2.3:a:microsoft:windows_data_access_components:6.0:*:*:*:*:*:*:* |