---
title: "CVE-2009-1535: The WebDAV extension in Microsoft Internet… | CubePath"
description: "The WebDAV extension in Microsoft Internet Information Services (IIS) 5.1 and 6.0 allows remote attackers to bypass URI-based protection mechanisms…"
language: en
source: https://cubepath.com/security/cve/CVE-2009-1535
---

# CVE-2009-1535: The WebDAV extension in Microsoft Internet… | CubePath

## Description

The WebDAV extension in Microsoft Internet Information Services (IIS) 5.1 and 6.0 allows remote attackers to bypass URI-based protection mechanisms, and list folders or read, create, or modify files, via a %c0%af (Unicode / character) at an arbitrary position in the URI, as demonstrated by inserting %c0%af into a "/protected/" initial pathname component to bypass the password protection on the protected\\ folder, aka "IIS 5.1 and 6.0 WebDAV Authentication Bypass Vulnerability," a different vulnerability than CVE-2009-1122.

Official description from the CVE record, published by microsoft. Copyright © 1999-2026 The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CVE license. [View the record on cve.org](https://www.cve.org/CVERecord?id=CVE-2009-1535)

## Key data

### EPSS

Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days.

Score

0.98115 (98.1% probability)

Percentile

99.9%

Scores of

Nov 10, 2026

Model

v2026.06.15

## References

Links listed in the CVE record. They lead to other sites, which CubePath does not control.

- [oval:org.mitre.oval:def:6029](https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6029)  (oval.cisecurity.org) vdb-entry signature
- [MS09-020](https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-020)  (docs.microsoft.com) vendor-advisory
- [view.samurajdata.se/psview.php?id=023287d6&page=1](http://view.samurajdata.se/psview.php?id=023287d6&page=1)
- [isc.sans.org/diary.html?n&storyid=6397](http://isc.sans.org/diary.html?n&storyid=6397)
- [20090515 IIS6 + webdav and unicode rides again in 2009](http://archives.neohapsis.com/archives/fulldisclosure/2009-05/0135.html)  (archives.neohapsis.com) mailing-list
- [20090515 Re: IIS6 + webdav and unicode rides again in 2009](http://archives.neohapsis.com/archives/fulldisclosure/2009-05/0139.html)  (archives.neohapsis.com) mailing-list
- [blog.zoller.lu/2009/05/iis-6-webdac-auth-bypass-and-data.ht…](http://blog.zoller.lu/2009/05/iis-6-webdac-auth-bypass-and-data.html)
- [TA09-160A](http://www.us-cert.gov/cas/techalerts/TA09-160A.html)  (us-cert.gov) third-party-advisory
- [archives.neohapsis.com/archives/fulldisclosure/2009-05/att-…](http://archives.neohapsis.com/archives/fulldisclosure/2009-05/att-0135/IIS%5FAdvisory.pdf)
- [20090515 Re: IIS6 + webdav and unicode rides again in 2009](http://archives.neohapsis.com/archives/fulldisclosure/2009-05/0144.html)  (archives.neohapsis.com) mailing-list
- [20090616 IIS WebDav Vulnerability CVE ID](http://www.attrition.org/pipermail/vim/2009-June/002192.html)  (attrition.org) mailing-list

## Timeline

1. ID reserved May 5, 2009
2. Record published Jun 10, 2009
3. Record last updated Aug 7, 2024

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## About CubePath

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Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 20:01 UTC. [Sources and licenses](https://cubepath.com/security/cve/legal)