How severe is CVE-2011-0026?

CVE-2011-0026 has a CVSS 2.0 base score of 9.3, rated critical severity.

Is CVE-2011-0026 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 34% (98th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2011-0026?

CVE-2011-0026 primarily affects Microsoft Data Access Components. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2011-0026?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2011-0026 published?

CVE-2011-0026 was published on 2011-01-12 and last updated on 2026-06-16.

CVE-2011-0026

CVE-2011-0026 is a critical-severity vulnerability in Microsoft Data Access Components with a CVSS 2.0 base score of 9.3. Its EPSS exploit-prediction score of 34% places it in the 98th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-189.

Key facts

Severity: Critical (CVSS 2.0 base score 9.3)
EPSS exploit prediction: 34% (98th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-189
Affected product: Microsoft Data Access Components
Published: 2011-01-12
Last modified: 2026-06-16

Description

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."

Frequently asked questions

What is CVE-2011-0026?: 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."
How severe is CVE-2011-0026?: CVE-2011-0026 has a CVSS 2.0 base score of 9.3, rated critical severity.
Is CVE-2011-0026 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 34% (98th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2011-0026?: CVE-2011-0026 primarily affects Microsoft Data Access Components. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2011-0026?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2011-0026 published?: CVE-2011-0026 was published on 2011-01-12 and last updated on 2026-06-16.

References

Affected products (3)

cpe:2.3:a:microsoft:data_access_components:2.8:sp1:*:*:*:*:*:*
cpe:2.3:a:microsoft:data_access_components:2.8:sp2:*:*:*:*:*:*
cpe:2.3:a:microsoft:windows_data_access_components:6.0:*:*:*:*:*:*:*

More vulnerabilities in Microsoft Data Access Components

CVE-2003-0903 — Critical (CVSS 10.0): Buffer overflow in a component of Microsoft Data Access Components (MDAC) 2.5 through 2.8 allows remote attackers to…
CVE-2002-1918 — Critical (CVSS 10.0): Buffer overflow in Microsoft Active Data Objects (ADO) in Microsoft MDAC 2.5 through 2.7 allows remote attackers to…
CVE-1999-1011 — Critical (CVSS 10.0): The Remote Data Service (RDS) DataFactory component of Microsoft Data Access Components (MDAC) in IIS 3.x and 4.x…
CVE-2012-1891 — Critical (CVSS 9.8): Heap-based buffer overflow in Microsoft Data Access Components (MDAC) 2.8 SP1 and SP2 and Windows Data Access…
CVE-2011-0027 — Critical (CVSS 9.3): Microsoft Data Access Components (MDAC) 2.8 SP1 and SP2, and Windows Data Access Components (WDAC) 6.0, does not…
CVE-2006-5559 — Critical (CVSS 9.3): The Execute method in the ADODB.Connection 2.7 and 2.8 ActiveX control objects (ADODB.Connection.2.7 and…

All CVEs affecting Microsoft Data Access Components →

Other CWE-189 (Numeric Errors) vulnerabilities

CVE-2015-8396 — Critical (CVSS 10.0): Integer overflow in the ImageRegionReader::ReadIntoBuffer function in…
CVE-2015-7205 — Critical (CVSS 10.0): Integer underflow in the RTPReceiverVideo::ParseRtpPacket function in Mozilla Firefox before 43.0 and Firefox ESR 38.x…
CVE-2015-6575 — Critical (CVSS 10.0): SampleTable.cpp in libstagefright in Android before 5.1.1 LMY48I does not properly consider integer promotion, which…
CVE-2015-3864 — Critical (CVSS 10.0): Integer underflow in the MPEG4Extractor::parseChunk function in MPEG4Extractor.cpp in libstagefright in mediaserver in…
CVE-2015-3836 — Critical (CVSS 10.0): The Parse_wave function in arm-wt-22k/lib_src/eas_mdls.c in the Sonivox DLS-to-EAS converter in Android before 5.1.1…
CVE-2015-3834 — Critical (CVSS 10.0): Multiple integer overflows in the BnHDCP::onTransact function in media/libmedia/IHDCP.cpp in libstagefright in Android…

Browse all CWE-189 (Numeric Errors) vulnerabilities →