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Fencer Vulns
high 7.5

CVE-2009-1535 in the critical feed json

The WebDAV extension in Microsoft Internet Information Services (IIS) 5.1 and 6.0 allows remote attackers to bypass URI-based protection me…

published 2009-06-10 17 y ago modified 2026-06-16 4 mo ago also EUVD-2009-1531

cvss
7.5
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
98.1%
EPSS 98.1% chance of exploitation in 30 days, percentile 99.9%
public exploits
4
Metasploit, Exploit-DB

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.

Patch / fix

Timeline

  1. First public exploit (EDB-8704)
  2. Published

Exploit prediction

98.11% chance of exploitation in the next 30 days, higher than 99.9% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

CVSS scores

assigned by version score vector
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.