CVE-2009-1535
The WebDAV extension in Microsoft Internet Information Services (IIS) 5.1 and 6.0 allows remote...
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.
Exploit likelihood
What each source reports
NVD Score used
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.
- Record
CVE-2009-1535- CVSS 2.0
- 7.5 High
AV:N/AC:L/Au:N/C:P/I:P/A:P - Weakness
- CWE-287
- Updated
- 2026-11-02
CVE List No score
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.
- Record
CVE-2009-1535- Updated
- 2026-11-02
EUVDEUVD-2009-1531 No score
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.
- Record
EUVD-2009-1531- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-f2c7-qmx6-wq66 No score
The WebDAV extension in Microsoft Internet Information Services (IIS) 5.1 and 6.0 allows remote...
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.
- Record
GHSA-f2c7-qmx6-wq66- Weakness
- CWE-287
- Updated
- 2026-11-02
Affected products
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| Exploit-DB | Microsoft IIS 6.0 - WebDAV Remote Authentication Bypass (1) | 2009-05-15 |
| Exploit-DB | Microsoft IIS 6.0 - WebDAV Remote Authentication Bypass (2) | 2009-05-26 |
| Metasploit | MS09-020 IIS6 WebDAV Unicode Auth Bypass Directory Scanner | |
| Metasploit | MS09-020 IIS6 WebDAV Unicode Authentication Bypass |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, Exploit-DB, GitHub Advisories, Metasploit, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2009-1535 is a high vulnerability (CVSS 7.5) in Microsoft Internet Information Services, published June 10, 2009. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 98.1%, the 99th percentile. No source names a fixed version.
References
oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6029
docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-020
view.samurajdata.se/psview.php?id=023287d6&page=1
isc.sans.org/diary.html?n&storyid=6397
archives.neohapsis.com/archives/fulldisclosure/2009-05/0135.html
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blog.zoller.lu/2009/05/iis-6-webdac-auth-bypass-and-data.html
us-cert.gov/cas/techalerts/TA09-160A.html
attrition.org/pipermail/vim/2009-June/002192.html
nvd.nist.gov/vuln/detail/CVE-2009-1535
github.com/advisories/GHSA-f2c7-qmx6-wq66