CVE-2009-1535
The WebDAV extension in Microsoft Internet Information Services (IIS) 5.1 and 6.0 allows remote attackers to bypass URI-based protection…
- 7.5HighCVSS base score
- 98.1%Exploitation in 30 daysEPSS · top 0.1% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- 4Public exploitsMetasploit, Nuclei and Exploit-DB
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.
Public exploit
An exploit or proof of concept is public: anyone can try it against an unpatched system. The public collections list 2 Metasploit modules and 2 Exploit-DB entries for it.
Show the exploits4
Metasploit modules2 modules
- MS09-020 IIS6 WebDAV Unicode Auth Bypass Directory Scanner (Metasploit module) (opens in a new tab)
auxiliary/scanner/http/dir_webdav_unicode_bypassRank normal
- MS09-020 IIS6 WebDAV Unicode Authentication Bypass (Metasploit module) (opens in a new tab)
auxiliary/scanner/http/ms09_020_webdav_unicode_bypassRank normal
Exploit-DB2 entries
- Microsoft IIS 6.0 - WebDAV Remote Authentication Bypass (2) (Exploit-DB entry) (opens in a new tab)
EDB-ID 8806remote, windowspublished 26 May 2009Verified
- Microsoft IIS 6.0 - WebDAV Remote Authentication Bypass (1) (Exploit-DB entry) (opens in a new tab)
EDB-ID 8704remote, windowspublished 15 May 2009Verified
Modules, templates and exploits as listed by the Metasploit Framework (BSD-3-Clause), ProjectDiscovery's Nuclei templates (MIT) and the Exploit Database (GPLv2), read once a day. Where the data comes from
Timeline
ID reserved
By microsoft
- 36 days later
· 36 days later
Published
- 15 years later
· 15 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 2.0 | High7.5 | AV:N/AC:L/Au:N/C:P/I:P/A:P |
- EPSS (exploitation in 30 days)
- 98.1% · top 0.1% of all CVEs (11 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Affected products
n/a
- affected n/a
References
References11
- oval:org.mitre.oval:def:6029 (opens in a new tab)vdb-entrysignaturex_refsource_OVALx_transferred
- MS09-020 (opens in a new tab)vendor-advisoryx_refsource_MSx_transferred
- http://view.samurajdata.se/psview.php?id=023287d6&page=1 (opens in a new tab)x_refsource_MISCx_transferred
- http://isc.sans.org/diary.html?n&storyid=6397 (opens in a new tab)x_refsource_MISCx_transferred
- 20090515 IIS6 + webdav and unicode rides again in 2009 (opens in a new tab)mailing-listx_refsource_FULLDISCx_transferred
- 20090515 Re: IIS6 + webdav and unicode rides again in 2009 (opens in a new tab)mailing-listx_refsource_FULLDISCx_transferred
- http://blog.zoller.lu/2009/05/iis-6-webdac-auth-bypass-and-data.html (opens in a new tab)x_refsource_MISCx_transferred
- TA09-160A (opens in a new tab)third-party-advisoryx_refsource_CERTx_transferred
- http://archives.neohapsis.com/archives/fulldisclosure/2009-05/att-0135/IIS_Advisory.pdf (opens in a new tab)x_refsource_MISCx_transferred
- 20090515 Re: IIS6 + webdav and unicode rides again in 2009 (opens in a new tab)mailing-listx_refsource_FULLDISCx_transferred
- 20090616 IIS WebDav Vulnerability CVE ID (opens in a new tab)mailing-listx_refsource_VIMx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2009-1531 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2009-1535)Record last updated .