The WebDAV extension in Microsoft Internet Information Services (IIS) 5.1 and 6.0 allows…
Priority HIGH 78CWE-287Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- — Not recorded in CVSS 2.0
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- Partial · Partial · Partial
- Fix status
- No fix listed
Attack profile from CVSS 2.0 · NVD. Fix status from CNA. Impact type from CWE-287.
Summary
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.
Why it matters now
EPSS 0.98115 99th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 8
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:microsoft:internet_information_services:5.1:*:*:*:*:*:*:* | 5.1 | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_xp:-:sp2:*:*:professional:*:-:* | not specified by NVD | Running on | Microsoft |
| cpe:2.3:o:microsoft:windows_xp:-:sp3:*:*:professional:*:-:* | not specified by NVD | Running on | Microsoft |
| cpe:2.3:a:microsoft:internet_information_services:6.0:*:*:*:*:*:*:* | 6.0 | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_server_2003:-:sp2:*:*:*:*:*:* | not specified by NVD | Running on | Microsoft |
| cpe:2.3:o:microsoft:windows_server_2003:-:sp2:*:*:*:*:itanium:* | not specified by NVD | Running on | Microsoft |
| cpe:2.3:o:microsoft:windows_server_2003:-:sp2:*:*:*:*:x64:* | not specified by NVD | Running on | Microsoft |
| cpe:2.3:o:microsoft:windows_xp:-:sp2:*:*:professional:*:x64:* | not specified by NVD | Running on | Microsoft |
- cpe:2.3:a:microsoft:internet_information_services:5.1:*:*:*:*:*:*:* Versions 5.1 Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_xp:-:sp2:*:*:professional:*:-:* Versions not specified by NVD Running on ·Microsoft
- cpe:2.3:o:microsoft:windows_xp:-:sp3:*:*:professional:*:-:* Versions not specified by NVD Running on ·Microsoft
- cpe:2.3:a:microsoft:internet_information_services:6.0:*:*:*:*:*:*:* Versions 6.0 Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_server_2003:-:sp2:*:*:*:*:*:* Versions not specified by NVD Running on ·Microsoft
- cpe:2.3:o:microsoft:windows_server_2003:-:sp2:*:*:*:*:itanium:* Versions not specified by NVD Running on ·Microsoft
- cpe:2.3:o:microsoft:windows_server_2003:-:sp2:*:*:*:*:x64:* Versions not specified by NVD Running on ·Microsoft
- cpe:2.3:o:microsoft:windows_xp:-:sp2:*:*:professional:*:x64:* Versions not specified by NVD Running on ·Microsoft
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2009-1535
- 2026-10-03 Alias added: GHSA-f2c7-qmx6-wq66
References
Patch 1
Advisory 5
Other 5
- http://view.samurajdata.se/psview.php?id=023287d6&page=1
- 20090515 IIS6 + webdav and unicode rides again in 2009
- 20090515 Re: IIS6 + webdav and unicode rides again in 2009
- http://archives.neohapsis.com/archives/fulldisclosure/2009-05/att-0135/IIS_Advisory.pdf
- 20090515 Re: IIS6 + webdav and unicode rides again in 2009
More Microsoft Internet Information Services vulnerabilities
- TI-2017-04947 Buffer overflow in the ScStoragePathFromUrl function in the WebDAV service in Internet… KEVCVSS 3.1CRITICAL 9.8
- TI-2010-03770 Heap-based buffer overflow in the TELNET_STREAM_CONTEXT::OnSendData function in… CVSS 2.0HIGH 10.0
- TI-2007-02725 The "hit-highlighting" functionality in webhits.dll in Microsoft Internet Information… CVSS 2.0HIGH 10.0
- TI-2009-01064 The WebDAV extension in Microsoft Internet Information Services (IIS) 5.0 on Windows 2000… CVSS 2.0HIGH 7.5
- TI-2005-04103 The URL parser in Microsoft Internet Information Services (IIS) 5.1 on Windows XP… CVSS 2.0HIGH 7.8
- TI-2002-00075 Buffer overflow in the chunked encoding transfer mechanism in Internet Information Server… CVSS 2.0HIGH 7.5
Sources
- CVE-2009-1535 · CVE Program
- CVE-2009-1535 · NVD
- FIRST EPSS
- GHSA-f2c7-qmx6-wq66 · GitHub Advisory Database · CC BY 4.0
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