CVE-2009-4444

MEDIUMCVSS v2 · 6.06.0
EchelonGraph scoreLOW confidence

“—” beside the score: it is equal to NVD's CVSS v2 base score.

This CVE was only ever scored under CVSS v2.0. NVD CVSS v2.0 base 6.0 — NVD rates that MEDIUM (NVD's v2 bands: LOW 0.0–3.9 / MEDIUM 4.0–6.9 / HIGH 7.0–10.0; no CRITICAL band). Vector AV:N/AC:M/Au:S/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 64% exploitation probability in the next 30 days; it does not lift the v2 base. EPSS sets EG Risk's exploitation input. Confidence: LOW.

Triggered by: NVD CVSS v2.0 (legacy fallback)
Sources: NVD CVSS v2.0
Trending — 3 sources updated this weekElevated

Also known asEUVD-2009-4411 (ENISA EUVD) · GHSA-4jh7-wh4m-f4pq (GitHub Security Advisories)Source: ENISA EUVD

6.0EG
EchelonGraph verdictPlan mitigationRemediate within your standard update timelines (the SSVC decision on this page).
  • 102 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 64%
CISA-KEV: Not listedEPSS PROB: 64%CVSS v2: 6.0Exploit: No code on recordExposed services: 102

No fix has been recorded since the CVE record was published in 2009 — if the vendor still supports the product, apply the fixed version it names; if not, isolate the affected system (restrict network access to it, for example with a firewall, or keep it off the internet) or retire the product.

Microsoft Internet Information Services (IIS) 5.x and 6.x uses only the portion of a filename before a ; (semicolon) character to determine the file extension, which allows remote attackers to bypass intended extension restrictions of third-party upload applications via a filename with a (1) .asp, (2) .cer, or (3) .asa first extension, followed by a semicolon and a safe extension, as demonstrated by the use of asp.dll to handle a .asp;.jpg file.

Internet exposure · derived from Shodan data

102 internet-facing services (distinct ip:port) on record running a version that maps to CVE-2009-4444, in our KEV-Exposure radar’s Shodan-derived sample.

across 25 countries (United States, China, Canada, India, Italy)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)
6.0MEDIUMNVD never assigned a CVSS v3 rating to this CVE
EG Score
6.0MEDIUMlow confidence
EG Risk
52
EG Risk 52/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity60% × 45%
Impact severity (EG Severity): CVSS 6.0 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation64% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's BOD 26-04 default: no one has published Automatable for this CVE, and CISA treats it as “no” for a CVE not in KEV.
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (no CISA value, KEV listing or exploit code on record) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from Vulnrichment. EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: No fix has been recorded since the CVE record was published in 2009. If the vendor still supports the product, apply the fixed version it names within your standard update timelines; if it no longer does, isolate the affected system (restrict network access to it, for example with a firewall, or keep it off the internet) or retire the product.
EPSS PROB
64%
EPSS %ILE
99th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (6.0): severity, escalated by confirmed exploitation. This CVE's 6.0 is its impact severity (EG Severity), not escalated.

EG Severity
6.0 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v2.0 · CVSS v2.0AV:N/AC:M/Au:S/C:P/I:P/A:P
EG Likelihood
64% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-25). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

No fix has been recorded since the CVE record was published in 2009. If the vendor still supports the product, apply the fixed version it names within your standard update timelines; if it no longer does, isolate the affected system (restrict network access to it, for example with a firewall, or keep it off the internet) or retire the product.

Exploitation none (no CISA value, KEV listing or exploit code on record) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from Vulnrichment. EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). Where an input reads “CISA's BOD 26-04 default”, no one has published it for this CVE, and CISA's implementation guidance says: “If “Automatable” and “Technical Impact” information items about a CVE ID are not available and the CVE ID is not in the KEV Catalog, CISA will treat its values as “no” and “total,” respectively, until CISA or a third party provides metadata about the CVE ID. CISA will always provide the Vulnrichment data for a CVE ID listed in the KEV Catalog.” Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

December 29, 2009

Last Modified

April 23, 2026

References (6)

Data Freshness Timeline

(refreshed 9× in last 7d / 27× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 82 of 102 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 18 repeat rows among the latest 100 are merged into the row they repeat. The 20 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-25 19:23 UTCEG score recompute
  2. 2026-10-25 19:23 UTCGHSA enrichmentGHSA-4jh7-wh4m-f4pq
  3. 2026-10-25 16:25 UTCEPSS rescoreEPSS 64% · 99th percentile
  4. 2026-10-24 16:26 UTCEPSS rescoreEPSS 64% · 99th percentile
  5. 2026-10-23 16:26 UTCEPSS rescoreEPSS 64% · 99th percentile
  6. 2026-10-22 16:25 UTCEPSS rescoreEPSS 64% · 99th percentile
  7. 2026-10-21 16:25 UTCEPSS rescoreEPSS 64% · 99th percentile
  8. 2026-10-20 16:26 UTCEPSS rescoreEPSS 64% · 99th percentile
  9. 2026-10-19 16:25 UTCEPSS rescoreEPSS 64% · 99th percentile
  10. 2026-10-18 16:25 UTCEPSS rescoreEPSS 64% · 99th percentile
  11. 2026-10-18 11:41 UTCEG score recompute
  12. 2026-10-16 16:26 UTCEPSS rescoreEPSS 64% · 99th percentile
  13. 2026-10-15 16:25 UTCEPSS rescoreEPSS 64% · 99th percentile
  14. 2026-10-14 16:26 UTCEPSS rescoreEPSS 64% · 99th percentile
  15. 2026-10-13 16:26 UTCEPSS rescoreEPSS 64% · 99th percentile
  16. 2026-10-12 21:43 UTCEG score recompute
  17. 2026-10-12 16:26 UTCEPSS rescoreEPSS 64% · 99th percentile
  18. 2026-10-12 01:51 UTCEG score recompute
  19. 2026-10-10 19:54 UTCEPSS rescoreEPSS 64% · 99th percentile
  20. 2026-10-09 20:00 UTCEPSS rescoreEPSS 64% · 99th percentile
  21. 2026-10-07 23:38 UTCEPSS rescoreEPSS 64% · 99th percentile
  22. 2026-10-06 15:09 UTCEPSS rescoreEPSS 64% · 99th percentile
  23. 2026-10-04 23:16 UTCEPSS rescoreEPSS 64% · 99th percentile
  24. 2026-09-30 14:58 UTCEPSS rescoreEPSS 64% · 99th percentile
  25. 2026-09-29 08:01 UTCEG score recompute
Show 57 more
  1. 2026-09-27 13:39 UTCEPSS rescoreEPSS 64% · 99th percentile
  2. 2026-09-26 15:52 UTCEPSS rescoreEPSS 64% · 99th percentile
  3. 2026-09-24 13:57 UTCEPSS rescoreEPSS 64% · 99th percentile
  4. 2026-09-20 20:08 UTCEPSS rescoreEPSS 64% · 99th percentile
  5. 2026-09-16 13:58 UTCEPSS rescoreEPSS 64% · 99th percentile
  6. 2026-09-15 03:04 UTCEPSS rescoreEPSS 64% · 99th percentile
  7. 2026-09-12 14:54 UTCEPSS rescoreEPSS 64% · 99th percentile
  8. 2026-09-10 09:24 UTCEPSS rescoreEPSS 64% · 99th percentile
  9. 2026-09-06 13:41 UTCEPSS rescoreEPSS 64% · 99th percentile
  10. 2026-09-05 15:22 UTCEPSS rescoreEPSS 64% · 99th percentile
  11. 2026-09-04 13:55 UTCEPSS rescoreEPSS 64% · 99th percentile
  12. 2026-08-28 21:34 UTCEPSS rescoreEPSS 64% · 99th percentile
  13. 2026-08-26 14:40 UTCEPSS rescoreEPSS 64% · 99th percentile
  14. 2026-08-25 13:43 UTCEPSS rescoreEPSS 64% · 99th percentile
  15. 2026-08-19 16:58 UTCEPSS rescoreEPSS 64% · 99th percentile
  16. 2026-08-16 02:09 UTCEPSS rescoreEPSS 64% · 99th percentile
  17. 2026-08-15 01:25 UTCEPSS rescoreEPSS 64% · 99th percentile
  18. 2026-08-09 13:41 UTCEPSS rescoreEPSS 64% · 99th percentile
  19. 2026-08-06 13:41 UTCEPSS rescoreEPSS 64% · 99th percentile
  20. 2026-08-05 19:11 UTCEPSS rescoreEPSS 64% · 99th percentile
  21. 2026-07-30 01:26 UTCEPSS rescoreEPSS 64% · 99th percentile
  22. 2026-07-26 13:39 UTCEG score recomputeAssessed again: 6.0 MEDIUM
  23. 2026-07-25 14:12 UTCEPSS rescoreEPSS 64% · 99th percentile
  24. 2026-07-23 14:14 UTCEPSS rescoreEPSS 64% · 99th percentile
  25. 2026-07-23 01:00 UTCEG score recompute
  26. 2026-07-23 00:37 UTCEG score recompute▼ 5.50
  27. 2026-07-23 00:05 UTCEG score recomputeFirst assessed: 5.5 MEDIUM
  28. 2026-07-22 21:44 UTCEG score recompute
  29. 2026-07-22 14:03 UTCEPSS rescoreEPSS 64% · 99th percentile
  30. 2026-07-20 17:03 UTCEPSS rescoreEPSS 64% · 99th percentile
  31. 2026-07-16 16:58 UTCEPSS rescoreEPSS 64% · 99th percentile
  32. 2026-07-15 16:54 UTCEPSS rescoreEPSS 64% · 99th percentile
  33. 2026-07-13 22:25 UTCEPSS rescoreEPSS 64% · 99th percentile
  34. 2026-07-11 08:22 UTCEPSS rescoreEPSS 64% · 99th percentile
  35. 2026-07-08 15:10 UTCEPSS rescoreEPSS 64% · 99th percentile
  36. 2026-07-06 02:19 UTCEPSS rescoreEPSS 64% · 99th percentile
  37. 2026-07-01 15:02 UTCEPSS rescoreEPSS 64% · 99th percentile
  38. 2026-06-28 04:52 UTCEPSS rescoreEPSS 64% · 99th percentile
  39. 2026-06-27 03:05 UTCEPSS rescoreEPSS 64% · 99th percentile
  40. 2026-06-25 13:46 UTCEPSS rescoreEPSS 64% · 99th percentile
  41. 2026-06-24 14:02 UTCEPSS rescoreEPSS 64% · 99th percentile
  42. 2026-06-23 21:29 UTCEPSS rescoreEPSS 64% · 99th percentile
  43. 2026-06-18 17:49 UTCEPSS rescoreEPSS 64% · 99th percentile
  44. 2026-06-17 17:49 UTCEPSS rescoreEPSS 64% · 99th percentile
  45. 2026-06-16 17:49 UTCEPSS rescoreEPSS 64% · 99th percentile
  46. 2026-06-15 17:44 UTCEPSS rescoreEPSS 64% · 99th percentile
  47. 2026-06-13 22:57 UTCEPSS rescoreEPSS 59% · 98th percentile
  48. 2026-06-12 23:08 UTCEPSS rescoreEPSS 59% · 98th percentile
  49. 2026-06-11 13:56 UTCEPSS rescoreEPSS 59% · 98th percentile
  50. 2026-06-10 22:14 UTCEPSS rescoreEPSS 59% · 98th percentile
  51. 2026-06-10 13:17 UTCEPSS rescoreEPSS 59% · 98th percentile
  52. 2026-06-07 15:22 UTCEPSS rescoreEPSS 59% · 98th percentile
  53. 2026-06-05 22:44 UTCEPSS rescoreEPSS 59% · 98th percentile
  54. 2026-06-05 06:07 UTCEPSS rescoreEPSS 59% · 98th percentile
  55. 2026-06-02 20:10 UTCEPSS rescoreEPSS 59% · 98th percentile
  56. 2026-06-01 13:49 UTCEPSS rescoreEPSS 59% · 98th percentile
  57. 2026-05-31 00:13 UTCEPSS rescoreEPSS 59% · 98th percentile

Frequently asked(4)

What is CVE-2009-4444?
CVE-2009-4444 is a medium-severity vulnerability; its CVE record was published on December 29, 2009. Microsoft Internet Information Services (IIS) 5.x and 6.x uses only the portion of a filename before a ; (semicolon) character to determine the file extension, which allows remote attackers to bypass intended extension restrictions of third-party upload applications via a filename with a (1) .asp,…
When was the CVE record for CVE-2009-4444 published?
The CVE record for CVE-2009-4444 was published on December 29, 2009. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of April 23, 2026; the record at its source may have been updated since.
Is CVE-2009-4444 actively exploited?
CVE-2009-4444 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 64% probability of exploitation in the next 30 days (99th percentile of EPSS-scored CVEs).
How do I remediate CVE-2009-4444?
No fix for CVE-2009-4444 has been recorded since its CVE record was published in 2009. If the vendor still supports the product, apply the fixed version it names; if it no longer does, isolate the affected system (restrict network access to it, for example with a firewall, or keep it off the internet) or retire the product.

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