CVE-2009-1535

NONECVSS 0.09.0▲
EchelonGraph scoreLOW confidence

Score elevated to 9.0 because EPSS predicts 92% probability of exploitation within the next 30 days (top 0.3% of all CVEs). Confidence: see factors.

Triggered by: EPSS exploit prediction ≥85%
Sources: epss
Weaponized
0.0
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • 60 internet-exposed hosts are running an affected version right now
  • High exploitation likelihood — EPSS 98%
CISA-KEV: Not listedEPSS: 98%CVSS: —Exploit: NoneExposed: 60

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

Live · internet exposure

60 internet-exposed hosts are running an affected version of CVE-2009-1535 right now.

across 22 countries (United States, China, Hong Kong, Germany, France)top: internet_information_services
See the live KEV-Exposure radar →Found passively from public internet-scan data — aggregate, host-redacted.

EchelonGraph is the only CVE feed that fuses live vulnerability intelligence with its own live internet-exposure radar — so you see not just that a CVE is exploited, but how much of the internet is exposed to it right now.

CVSS v3
—
EG Score
9.0(low)
EPSS
99.9%
KEV
Not listed

Published

June 10, 2009

Last Modified

April 23, 2026

References (22)

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 1× in last 7d / 15× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-06 16:23 UTCEPSS rescore
  2. 2026-06-25 13:46 UTCEPSS rescore
  3. 2026-06-25 13:46 UTCEPSS rescore
  4. 2026-06-23 21:29 UTCEPSS rescore
  5. 2026-06-23 21:29 UTCEPSS rescore
  6. 2026-06-16 17:49 UTCEPSS rescore
  7. 2026-06-16 17:49 UTCEPSS rescore
  8. 2026-06-15 17:44 UTCEPSS rescore
  9. 2026-06-14 23:14 UTCEPSS rescore
  10. 2026-06-14 23:14 UTCEPSS rescore
  11. 2026-06-12 23:08 UTCEPSS rescore
  12. 2026-06-12 23:08 UTCEPSS rescore
  13. 2026-06-10 22:14 UTCEPSS rescore
  14. 2026-06-10 13:17 UTCEPSS rescore
  15. 2026-06-08 14:13 UTCEPSS rescore
  16. 2026-06-06 13:44 UTCEPSS rescore
  17. 2026-06-06 13:44 UTCEPSS rescore
  18. 2026-06-06 13:44 UTCEPSS rescore
  19. 2026-06-05 22:44 UTCEPSS rescore
  20. 2026-06-05 22:44 UTCEPSS rescore
  21. 2026-05-30 16:35 UTCEG score recompute
  22. 2026-05-30 16:35 UTCGHSA enrichment
  23. 2026-05-28 13:42 UTCEPSS rescore
  24. 2026-05-28 13:42 UTCEPSS rescore
  25. 2026-05-28 13:42 UTCEPSS rescore
Show 7 more
  1. 2026-05-26 07:16 UTCEPSS rescore
  2. 2026-05-26 07:16 UTCEPSS rescore
  3. 2026-05-22 21:15 UTCEPSS rescore
  4. 2026-05-22 21:15 UTCEPSS rescore
  5. 2026-05-20 22:37 UTCEPSS rescore
  6. 2026-05-20 22:37 UTCEPSS rescore
  7. 2026-05-18 21:29 UTCEPSS rescore

Publicly available exploits

(4 references)

Working exploit code is in the public domain (2 Metasploit modules) (2 Exploit-DB entries). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Exploit-DBEDB-8806✓ verified
    First seen May 26, 2009

    Microsoft IIS 6.0 - WebDAV Remote Authentication Bypass (2)

    Open source ↗
  • Exploit-DBEDB-8704✓ verified
    First seen May 15, 2009

    Microsoft IIS 6.0 - WebDAV Remote Authentication Bypass (1)

    Open source ↗
  • Metasploitauxiliary/scanner/http/ms09_020_webdav_unicode_bypass✓ verified
    First seen Jan 1, 2009

    MS09-020 IIS6 WebDAV Unicode Authentication Bypass

    Open source ↗
  • Metasploitauxiliary/scanner/http/dir_webdav_unicode_bypass✓ verified
    First seen Jan 1, 2009

    MS09-020 IIS6 WebDAV Unicode Auth Bypass Directory Scanner

    Open source ↗

Related CVEs(same CWE)

Frequently asked(4)

What is CVE-2009-1535?
CVE-2009-1535 is a none vulnerability published on June 10, 2009. 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…
When was CVE-2009-1535 disclosed?
CVE-2009-1535 was first published in the National Vulnerability Database on June 10, 2009, with the most recent update on April 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2009-1535 actively exploited?
CVE-2009-1535 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 99.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
How do I remediate CVE-2009-1535?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2009-1535, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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