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CVE-2009-1535 is an authentication and access-control bypass in the WebDAV extension of Microsoft Internet Information Services (IIS) 5.1 and 6.0. The flaw is caused by improper handling and normalization of Unicode-encoded path separator tokens in request URIs, specifically use of %c0%af. According to the provided context, IIS WebDAV removes or normalizes these Unicode characters after security checks, allowing an attacker to place %c0%af at an arbitrary position in the URI and evade URI-based protection mechanisms. In practice, this can bypass protections on restricted paths such as a protected initial pathname component and permit unauthorized WebDAV operations against resources that should require authentication or be otherwise blocked. This issue is distinct from CVE-2009-1122 and is also referred to as the "IIS 5.1 and 6.0 WebDAV Authentication Bypass Vulnerability."
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No valid public exploits. Mallory filtered out 2 candidates as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A specific CVE referenced in the file upload security bypass reference list, but not described in detail in the content.
A referenced IIS/ASP security bypass vulnerability tied to file extension parsing and upload-related execution bypass issues.
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Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.