CVE-2009-0901: microsoft visual_c\# Code Injection
Vulnerability summary
CVE-2009-0901 is a high (CVSS 9.3) Code Injection vulnerability in microsoft visual_c\#. EPSS estimates a 36.61% chance of exploitation in the next 30 days, higher than 98.4% of scored vulnerabilities.
Timeline
- 29-07-2009PublishedVulnerability first disclosed.
- 27-05-2026Last modifiedVulnerability information updated.
Description
The Active Template Library (ATL) in Microsoft Visual Studio .NET 2003 SP1, Visual Studio 2005 SP1 and 2008 Gold, and Visual C++ 2005 SP1 and 2008 Gold and SP1; and Windows 2000 SP4, XP SP2 and SP3, Server 2003 SP2, Vista Gold, SP1, and SP2, and Server 2008 Gold and SP2; does not prevent VariantClear calls on an uninitialized VARIANT, which allows remote attackers to execute arbitrary code via a malformed stream to an ATL (1) component or (2) control, related to ATL headers and error handling, aka "ATL Uninitialized Object Vulnerability."
CVSS metrics
3 scores · 2 sources · 2 versions- NVDNIST8.8HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS trend
Probability
36.61%
Chance of exploitation in the next 30 days
Percentile
98%
Versus all other CVEs
30-day change
0.00 pp
From 36.61% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root cause- CWE-94Improper Control of Generation of Code ('Code Injection')The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.
- CWE-457Use of Uninitialized VariableThe code uses a variable that has not been initialized, leading to unpredictable or unintended results.
Affected systems
Microsoft3 products
- visual_c\#2005:sp1_redistribution_pkg | 2008:redistribution_pkg | 2008:sp1_redistribution_pkg
- visual_studio2005:sp1 | 2008 | 2008:sp1
- visual_studio_.net2003:sp1
1 vendor · 3 products
References
25 links- www.us-cert.gov/cas/techalerts/TA09-223A.htmlThird Party AdvisoryX Refsource CERTUS Government Resource
- www.adobe.com/support/security/bulletins/apsb09-13.htmlX Refsource CONFIRM
- www.novell.com/support/viewContent.do?externalId=7004997&sliceId=1X Refsource CONFIRM
- www.us-cert.gov/cas/techalerts/TA09-286A.htmlThird Party AdvisoryX Refsource CERTUS Government Resource
docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-035Vendor AdvisoryX Refsource MS- blogs.technet.com/srd/…X Refsource MISC
Show all 25 references
- oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7581VDB EntrySignatureX Refsource OVAL
- oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6289VDB EntrySignatureX Refsource OVAL
- oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6311VDB EntrySignatureX Refsource OVAL
- www.adobe.com/support/security/bulletins/apsb09-10.htmlX Refsource CONFIRM
- docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-037Vendor AdvisoryX Refsource MS
- oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6373VDB EntrySignatureX Refsource OVAL
- www.us-cert.gov/cas/techalerts/TA09-195A.htmlThird Party AdvisoryX Refsource CERTUS Government Resource
- docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-060Vendor AdvisoryX Refsource MS