CVE-2009-1122

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.
  • 13 internet-exposed hosts are running an affected version right now
  • High exploitation likelihood — EPSS 98%
CISA-KEV: Not listedEPSS: 98%CVSS: —Exploit: NoneExposed: 13

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

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

across 7 countries (Canada, France, Germany, Korea, Republic of, South Africa)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 (14)

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 1× in last 7d / 11× 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. 2026-07-01 15:02 UTCEPSS rescore
  2. 2026-06-27 03:05 UTCEPSS rescore
  3. 2026-06-25 13:46 UTCEPSS rescore
  4. 2026-06-25 13:46 UTCEPSS rescore
  5. 2026-06-24 14:02 UTCEPSS rescore
  6. 2026-06-24 14:02 UTCEPSS rescore
  7. 2026-06-17 17:49 UTCEPSS rescore
  8. 2026-06-17 17:49 UTCEPSS rescore
  9. 2026-06-15 17:44 UTCEPSS rescore
  10. 2026-06-13 22:57 UTCEPSS rescore
  11. 2026-06-10 22:14 UTCEPSS rescore
  12. 2026-06-07 15:22 UTCEPSS rescore
  13. 2026-06-07 15:22 UTCEPSS rescore
  14. 2026-06-06 13:44 UTCEPSS rescore
  15. 2026-06-06 13:44 UTCEPSS rescore
  16. 2026-06-06 13:44 UTCEPSS rescore
  17. 2026-06-04 13:09 UTCEPSS rescore
  18. 2026-06-04 13:09 UTCEPSS rescore
  19. 2026-05-30 16:33 UTCEG score recompute
  20. 2026-05-30 16:33 UTCGHSA enrichment
  21. 2026-05-29 13:40 UTCEPSS rescore
  22. 2026-05-28 13:42 UTCEPSS rescore
  23. 2026-05-28 13:42 UTCEPSS rescore
  24. 2026-05-28 13:42 UTCEPSS rescore
  25. 2026-05-26 07:16 UTCEPSS rescore
Show 6 more
  1. 2026-05-26 07:16 UTCEPSS rescore
  2. 2026-05-20 22:37 UTCEPSS rescore
  3. 2026-05-20 22:37 UTCEPSS rescore
  4. 2026-05-20 11:21 UTCEPSS rescore
  5. 2026-05-20 11:20 UTCEPSS rescore
  6. 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 none 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 99.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
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

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