CVE-2009-1122

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 98.2% exploitation probability in the next 30 days, which is reflected in EG Risk but does not lift the v2 base. Confidence: LOW.

Sources: epss, nvd_v2
Trending — 3 sources updated this weekWeaponized
7.5EG
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • 18 internet-exposed hosts are running an affected version right now
  • High exploitation likelihood — EPSS 94%
  • Public exploit code is available (Metasploit, Exploit-DB (verified), epss top5pct, epss high, public exploit)
CISA-KEV: Not listedEPSS PROB: 94%CVSS v2: 7.5Exploit: Metasploit · Exploit-DB (verified) · epss top5pct · epss high · public exploitExposed: 18

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) 5.0 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.

Live · internet exposure

18 internet-exposed hosts are running an affected version of CVE-2009-1122 right now.

across 8 countries (Canada, Korea, Republic of, United States, Japan, Italy)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 v2.0 (legacy)
7.5HIGHNVD never assigned a CVSS v3 rating to this CVE
EG Score
7.5(low)
EG Risk
78(Track)
EG Risk 78/100SSVC: Track

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%
Action: Routine — remediate on your standard cadence.
EPSS PROB
94%
EPSS %ILE
100%
KEV
Not listed

Published

June 10, 2009

Last Modified

April 23, 2026

References (14)

Weakness Classification(1)

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

Data Freshness Timeline

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

Publicly available exploits

(3 references)

Working exploit code is in the public domain (2 Metasploit modules) (1 Exploit-DB entry). 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 ↗
  • 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-2009-1122?
CVE-2009-1122 is a high vulnerability published on June 10, 2009. 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…
When was CVE-2009-1122 disclosed?
CVE-2009-1122 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-2009-1122 actively exploited?
CVE-2009-1122 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 94% probability of exploitation in the next 30 days, which ranks it in the top 0.2% of all scored CVEs.
How do I remediate CVE-2009-1122?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2009-1122, 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

Explore the affected products and dependency analysis for CVE-2009-1122

Explore →

Is Your Infrastructure Affected by CVE-2009-1122?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs