CVE-2009-1122
The WebDAV extension in Microsoft Internet Information Services (IIS) 5.0 on Windows 2000 SP4 does not properly decode URLs, which allows…
- 7.5HighCVSS base score
- 98.4%Exploitation in 30 daysEPSS · top 0.1% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- 3Public exploitsMetasploit, Nuclei and Exploit-DB
Description
The WebDAV extension in Microsoft Internet Information Services (IIS) 5.0 on Windows 2000 SP4 does not properly decode URLs, which allows remote attackers to bypass authentication, and possibly read or create files, via a crafted HTTP request, aka "IIS 5.0 WebDAV Authentication Bypass Vulnerability," a different vulnerability than CVE-2009-1535.
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 an Exploit-DB entry for it.
Show the exploits3
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-DB1 entry
- Microsoft IIS 6.0 - WebDAV Remote Authentication Bypass (2) (Exploit-DB entry) (opens in a new tab)
EDB-ID 8806remote, windowspublished 26 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
- 3 months later
· 3 months 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)
- 98.4% · top 0.1% of all CVEs (9 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
7
- oval:org.mitre.oval:def:5861 (opens in a new tab)vdb-entrysignaturex_refsource_OVALx_transferred
- 1022358 (opens in a new tab)vdb-entryx_refsource_SECTRACKx_transferred
- MS09-020 (opens in a new tab)vendor-advisoryx_refsource_MSx_transferred
- 35232 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
- TA09-160A (opens in a new tab)third-party-advisoryx_refsource_CERTx_transferred
- ADV-2009-1539 (opens in a new tab)vdb-entryx_refsource_VUPENx_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-2009-1123 (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-2009-1122)Record last updated .