CVE-2009-2493

The Active Template Library (ATL) in Microsoft Visual Studio .NET 2003 SP1, Visual Studio 2005 SP1 and 2008 Gold and SP1, 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 properly restrict use of OleLoadFromStream in instantiating objects from data streams, which allows remote attackers to execute arbitrary code via a crafted HTML document with an ATL (1) component or (2) control, related to ATL headers and bypassing security policies, aka "ATL COM Initialization Vulnerability."

Published: 2009-07-29 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2009-2493 is rated Moderate Risk (64.7/100): CVSS High severity, with high exploitation likelihood (EPSS 43.39%, 99th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. 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.

Exploit prediction scoring system (EPSS) score for CVE-2009-2493

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 52.56% 43.39% -9.17%
2 2026-05-28 56.62% 52.56% -4.05%
3 2026-04-19 — 56.62% —

Full EPSS history (31 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2009-2493

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.8 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 5.9 134c704f-9b21-4f2e-91b3-4a467353bcc0
9.3 2.0 HIGH
AV:N/AC:M/Au:N/C:C/I:C/A:C Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:C)
Complete confidentiality impact.
Integrity impact (I:C)
Complete integrity impact.
Availability impact (A:C)
Complete availability impact.
 8.6 10.0 [email protected]

Weakness enumeration for CVE-2009-2493

GitHub Security Advisory for CVE-2009-2493

GHSA-xrpm-74v3-f6fq · Severity: high — The Active Template Library (ATL) in Microsoft Visual Studio .NET 2003 SP1, Visual Studio 2005...

Affected software / configurations for CVE-2009-2493

Vendor Product Version Raw CPE
microsoft visual_c\+\+ 2005 cpe:2.3:a:microsoft:visual_c\+\+:2005:sp1:*:*:*:*:*:*
microsoft visual_c\+\+ 2008 cpe:2.3:a:microsoft:visual_c\+\+:2008:*:*:*:*:*:*:*
microsoft visual_c\+\+ 2008 cpe:2.3:a:microsoft:visual_c\+\+:2008:sp1:*:*:*:*:*:*
microsoft windows_2000 — cpe:2.3:o:microsoft:windows_2000:*:sp4:*:*:*:*:*:*
microsoft windows_2003_server — cpe:2.3:o:microsoft:windows_2003_server:*:sp2:*:*:*:*:*:*
microsoft windows_server_2008 — cpe:2.3:o:microsoft:windows_server_2008:*:sp2:*:*:*:*:*:*
microsoft windows_server_2008 — cpe:2.3:o:microsoft:windows_server_2008:-:*:*:*:*:*:*:*
microsoft windows_vista — cpe:2.3:o:microsoft:windows_vista:*:sp1:*:*:*:*:*:*
microsoft windows_vista — cpe:2.3:o:microsoft:windows_vista:*:sp2:*:*:*:*:*:*
microsoft windows_vista — cpe:2.3:o:microsoft:windows_vista:-:*:*:*:*:*:*:*
microsoft windows_xp — cpe:2.3:o:microsoft:windows_xp:*:sp2:*:*:*:*:*:*
microsoft windows_xp — cpe:2.3:o:microsoft:windows_xp:*:sp3:*:*:*:*:*:*
microsoft visual_studio 2003 cpe:2.3:a:microsoft:visual_studio:2003:sp1:*:*:*:*:*:*
microsoft visual_studio 2005 cpe:2.3:a:microsoft:visual_studio:2005:sp1:*:*:*:*:*:*
microsoft visual_studio 2008 cpe:2.3:a:microsoft:visual_studio:2008:*:*:*:*:*:*:*
microsoft visual_studio 2008 cpe:2.3:a:microsoft:visual_studio:2008:sp1:*:*:*:*:*:*

References for CVE-2009-2493

URL Tags
http://blogs.technet.com/srd/archive/2009/08/11/ms09-037-why-we-are-using-cve-s-already-used-in-ms09-035.aspx Broken Link
http://lists.opensuse.org/opensuse-security-announce/2009-11/msg00002.html Third Party Advisory
http://marc.info/?l=bugtraq&m=126592505426855&w=2 Third Party Advisory
http://secunia.com/advisories/35967
http://secunia.com/advisories/36187
http://secunia.com/advisories/36374
http://secunia.com/advisories/36746
http://secunia.com/advisories/38568
http://secunia.com/advisories/41818
http://sunsolve.sun.com/search/document.do?assetkey=1-66-264648-1 Broken Link
http://sunsolve.sun.com/search/document.do?assetkey=1-66-266108-1 Broken Link
http://sunsolve.sun.com/search/document.do?assetkey=1-77-1020775.1-1 Broken Link
http://www.adobe.com/support/security/advisories/apsa09-04.html Patch Third Party Advisory
http://www.adobe.com/support/security/bulletins/apsb09-10.html Third Party Advisory
http://www.adobe.com/support/security/bulletins/apsb09-11.html Patch Third Party Advisory
http://www.adobe.com/support/security/bulletins/apsb09-13.html Third Party Advisory
http://www.novell.com/support/viewContent.do?externalId=7004997&sliceId=1 Third Party Advisory
http://www.openoffice.org/security/cves/CVE-2009-2493.html Third Party Advisory
http://www.us-cert.gov/cas/techalerts/TA09-195A.html Third Party Advisory US Government Resource
http://www.us-cert.gov/cas/techalerts/TA09-223A.html Third Party Advisory US Government Resource
http://www.us-cert.gov/cas/techalerts/TA09-286A.html Third Party Advisory US Government Resource
http://www.us-cert.gov/cas/techalerts/TA09-342A.html Third Party Advisory US Government Resource
http://www.vupen.com/english/advisories/2009/2034
http://www.vupen.com/english/advisories/2009/2232
http://www.vupen.com/english/advisories/2010/0366
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-035
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-037
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-055
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-060
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-072
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6245
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6304
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6421
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6473
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6621
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6716
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