85573 : Microsoft IE CTreeNode Object ISpanQualifier Instance Type Confusion Use-after-free Memory Corruption
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Disclosure Date
Time to Patch
59 days


Microsoft Internet Explorer contains a flaw that is triggered as user-supplied input is not properly sanitized when handling CTreeNode objects. This will result in a type confusion between a CTreeNode object and an ISpanQualifier instance, which will cause a use-after-free error that will corrupt memory. This may allow a remote attacker to cause a loss of availability for the system or potentially allow the attacker to execute arbitrary code.


Location: Context Dependent
Attack Type: Input Manipulation
Impact: Loss of Integrity
Solution: Patch / RCS
Exploit: Exploit Private
Disclosure: Vendor Verified, Coordinated Disclosure
OSVDB: Web Related


Currently, there are no known workarounds or upgrades to correct this issue. However, Microsoft has released a patch to address this vulnerability. Check the vendor advisory or solution in the references section.


Microsoft Corporation
Internet Explorer



CVSSv2 Score

CVSSv2 Base Score = 9.3
Source: nvd.nist.gov | Generated: 2012-09-24 | Disagree?

Access_vector_2 Access_complexity_1 Authentication_2 Confidentiality_impact_2 Integrity_impact_2 Availability_impact_2


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