CVE-2009-1535

HIGHCVSS v2 · 7.57.5—
EchelonGraph scoreLOW confidence

This CVE was only ever scored under CVSS v2.0. NVD CVSS v2.0 base 7.5 — v2 rates that HIGH (v2 bands: LOW 0.0–3.9 / MEDIUM 4.0–6.9 / HIGH 7.0–10.0; v2 has no CRITICAL band). Vector AV:N/AC:L/Au:N/C:P/I:P/A:P. CVSS v2 is an older, coarser metric than v3.1/v4.0 (no Scope, no User Interaction, no Attack Requirements), so it is not directly comparable to a v3 or v4 score. NVD has never re-scored this record under v3. EPSS predicts 98.1% exploitation probability in the next 30 days, which is reflected in EG Risk but does not lift the v2 base. Confidence: LOW.

Triggered by: NVD CVSS v2.0 (legacy fallback)
Sources: epss, nvd_v2
Weaponized
7.5EG
EchelonGraph verdictMitigate this weekExploitation is likely or a public exploit exists.
  • 173 internet-facing services (distinct ip:port) on record running an affected version — derived from Shodan data (© Shodan); a patched service can stay counted while its port stays open
  • High exploitation likelihood — EPSS 98%
  • Public exploit code is available (Metasploit, Exploit-DB (verified), epss top5pct, epss high, public exploit)
CISA-KEV: Not listedEPSS PROB: 98%CVSS v2: 7.5Exploit: Metasploit · Exploit-DB (verified) · epss top5pct · epss high · public exploitExposed services: 173

A fix is referenced (a reference tagged "Patch", often a source commit), but no release containing it is confirmed — find the release that contains it; until it is applied, mitigate (WAF / firewall / segmentation).

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.

Internet exposure · derived from Shodan data

173 internet-facing services (distinct ip:port) on record running a version that maps to CVE-2009-1535, in our KEV-Exposure radar’s Shodan-derived sample.

across 30 countries (United States, China, Spain, Italy, Brazil)top: internet_information_services
See the KEV-Exposure radar →Derived from Shodan data. Shodan data is owned by Shodan, which holds its copyright (© Shodan). EchelonGraph claims no ownership of it or copyright in it. Aggregate, host-redacted.

How it counts: every 12 hours, when Shodan query credits allow, the radar runs one Shodan query per tracked product, reads up to 100 ip:port services per query, and keeps a service when its banner version matches a CISA-KEV or high-EPSS CVE; a service is dropped when neither a search nor a Shodan InternetDB port re-check has refreshed it for 21 days. A re-check that finds the port still listed by Shodan InternetDB refreshes the service without re-reading the banner, so a patched service can stay counted while its port stays open. A count is a banner-version inference over a sample, not an exploit test and not an internet-wide census, and the unit is a service, not a machine: a machine answering on two ports counts twice.

CVSS v2.0 (legacy)
7.5HIGHNVD never assigned a CVSS v3 rating to this CVE
EG Score
7.5HIGHlow confidence
EG Risk
77
EG Risk 77/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity75% × 45%
Exploitation98% × 40%
Automatability30% × 15%
CISA SSVC: Track at low, Track or Track* at medium and Track* or Attend at high mission impact.
Action: A fix is referenced, but no release containing it is confirmed. Check the referenced fix and the vendor's advisory for a release that contains it and apply that within your standard update timelines at low or medium mission impact and sooner than that at high; until then, restrict network exposure of the affected system or apply the vendor's mitigation.
EPSS PROB
98%
EPSS %ILE
99th
KEV
Not listed

CISA SSVCTrack at low, Track or Track* at medium and Track* or Attend at high mission impact.

A fix is referenced, but no release containing it is confirmed. Check the referenced fix and the vendor's advisory for a release that contains it and apply that within your standard update timelines at low or medium mission impact and sooner than that at high; until then, restrict network exposure of the affected system or apply the vendor's mitigation.

Exploitation public PoC (EG-KEV: weaponized) · Automatable unknown (not published for this CVE) · Technical impact unknown (not published for this CVE). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

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 0× in last 7d / 2× 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. 2026-09-29 07:58 UTCEG score recompute
  2. 2026-09-26 15:52 UTCEPSS rescore
  3. 2026-09-10 09:24 UTCEPSS rescore
  4. 2026-08-25 13:43 UTCEPSS rescore
  5. 2026-07-30 16:22 UTCEPSS rescore
  6. 2026-07-26 13:38 UTCEG score recompute▲ 7.50
  7. 2026-07-25 14:12 UTCEPSS rescore
  8. 2026-07-24 14:12 UTCEPSS rescore
  9. 2026-07-23 01:06 UTCGHSA enrichment
  10. 2026-07-23 01:05 UTCGHSA enrichment
  11. 2026-07-23 01:04 UTCGHSA enrichment
  12. 2026-07-23 01:03 UTCGHSA enrichment
  13. 2026-07-23 01:03 UTCGHSA enrichment
  14. 2026-07-23 01:02 UTCGHSA enrichment
  15. 2026-07-23 01:01 UTCGHSA enrichment
  16. 2026-07-23 00:59 UTCGHSA enrichment
  17. 2026-07-23 00:58 UTCGHSA enrichment
  18. 2026-07-23 00:57 UTCGHSA enrichment
  19. 2026-07-23 00:56 UTCGHSA enrichment
  20. 2026-07-23 00:55 UTCGHSA enrichment
  21. 2026-07-23 00:54 UTCGHSA enrichment
  22. 2026-07-23 00:53 UTCGHSA enrichment
  23. 2026-07-23 00:52 UTCGHSA enrichment
  24. 2026-07-23 00:51 UTCGHSA enrichment
  25. 2026-07-23 00:50 UTCGHSA enrichment
Show 49 more
  1. 2026-07-23 00:49 UTCGHSA enrichment
  2. 2026-07-23 00:48 UTCGHSA enrichment
  3. 2026-07-23 00:47 UTCGHSA enrichment
  4. 2026-07-23 00:46 UTCGHSA enrichment
  5. 2026-07-23 00:44 UTCGHSA enrichment
  6. 2026-07-23 00:43 UTCGHSA enrichment
  7. 2026-07-23 00:43 UTCGHSA enrichment
  8. 2026-07-23 00:42 UTCEG score recompute
  9. 2026-07-23 00:42 UTCGHSA enrichment
  10. 2026-07-23 00:40 UTCGHSA enrichment
  11. 2026-07-23 00:38 UTCGHSA enrichment
  12. 2026-07-23 00:36 UTCEG score recompute▼ 9.00
  13. 2026-07-23 00:03 UTCEG score recompute
  14. 2026-07-22 21:42 UTCEG score recompute
  15. 2026-07-16 16:58 UTCEPSS rescore
  16. 2026-07-11 08:22 UTCEPSS rescore
  17. 2026-07-11 08:22 UTCEPSS rescore
  18. 2026-07-06 16:23 UTCEPSS rescore
  19. 2026-06-25 13:46 UTCEPSS rescore
  20. 2026-06-25 13:46 UTCEPSS rescore
  21. 2026-06-23 21:29 UTCEPSS rescore
  22. 2026-06-23 21:29 UTCEPSS rescore
  23. 2026-06-16 17:49 UTCEPSS rescore
  24. 2026-06-16 17:49 UTCEPSS rescore
  25. 2026-06-15 17:44 UTCEPSS rescore
  26. 2026-06-14 23:14 UTCEPSS rescore
  27. 2026-06-14 23:14 UTCEPSS rescore
  28. 2026-06-12 23:08 UTCEPSS rescore
  29. 2026-06-12 23:08 UTCEPSS rescore
  30. 2026-06-10 22:14 UTCEPSS rescore
  31. 2026-06-10 13:17 UTCEPSS rescore
  32. 2026-06-08 14:13 UTCEPSS rescore
  33. 2026-06-06 13:44 UTCEPSS rescore
  34. 2026-06-06 13:44 UTCEPSS rescore
  35. 2026-06-06 13:44 UTCEPSS rescore
  36. 2026-06-05 22:44 UTCEPSS rescore
  37. 2026-06-05 22:44 UTCEPSS rescore
  38. 2026-05-30 16:35 UTCEG score recompute
  39. 2026-05-30 16:35 UTCGHSA enrichment
  40. 2026-05-28 13:42 UTCEPSS rescore
  41. 2026-05-28 13:42 UTCEPSS rescore
  42. 2026-05-28 13:42 UTCEPSS rescore
  43. 2026-05-26 07:16 UTCEPSS rescore
  44. 2026-05-26 07:16 UTCEPSS rescore
  45. 2026-05-22 21:15 UTCEPSS rescore
  46. 2026-05-22 21:15 UTCEPSS rescore
  47. 2026-05-20 22:37 UTCEPSS rescore
  48. 2026-05-20 22:37 UTCEPSS rescore
  49. 2026-05-18 21:29 UTCEPSS rescore

Publicly available exploits

(4 references)

Public exploit code is referenced for this CVE (2 Metasploit modules, 2 Exploit-DB entries). Defenders should treat patch urgency accordingly.

  • Metasploitauxiliary/scanner/http/ms09_020_webdav_unicode_bypass✓ verified
    Published Jul 28, 2009

    MS09-020 IIS6 WebDAV Unicode Authentication Bypass

    Open source ↗
  • Exploit-DBEDB-8806✓ verified
    Published May 26, 2009

    Microsoft IIS 6.0 - WebDAV Remote Authentication Bypass (2)

    Open source ↗
  • Metasploitauxiliary/scanner/http/dir_webdav_unicode_bypass✓ verified
    Published May 18, 2009

    MS09-020 IIS6 WebDAV Unicode Auth Bypass Directory Scanner

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

    Microsoft IIS 6.0 - WebDAV Remote Authentication Bypass (1)

    Open source ↗

Related CVEs(same CWE)

Frequently asked(4)

What is CVE-2009-1535?
CVE-2009-1535 is a high 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 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. EchelonGraph's EG-KEV model classifies it as weaponized: a functional public exploit exists. FIRST EPSS estimates a 98% probability of exploitation in the next 30 days (99th percentile of EPSS-scored CVEs).
How do I remediate CVE-2009-1535?
A fix for CVE-2009-1535 is referenced (a reference tagged "Patch", often a source commit), but EchelonGraph has no release containing it on record. Check that reference and the vendor's advisory for a release that contains the fix and update to it; until then, restrict network exposure of the affected system or apply the vendor's mitigation.

Dependency Blast Radius

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