CVE-2001-1243

MEDIUMCVSS v2 · 5.05.0—
EchelonGraph scoreLOW confidence

This CVE was only ever scored under CVSS v2.0. NVD CVSS v2.0 base 5.0 — v2 rates that MEDIUM (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:N/I:N/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 63.2% 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
Weaponized
5.0EG
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • 17 internet-exposed hosts are running an affected version right now
  • High exploitation likelihood — EPSS 50%
  • Public exploit code is available (Exploit-DB (verified), epss top5pct, epss high, public exploit)
CISA-KEV: Not listedEPSS PROB: 50%CVSS v2: 5.0Exploit: Exploit-DB (verified) · epss top5pct · epss high · public exploitExposed: 17

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

Scripting.FileSystemObject in asp.dll for Microsoft IIS 4.0 and 5.0 allows local or remote attackers to cause a denial of service (crash) via (1) creating an ASP program that uses Scripting.FileSystemObject to open a file with an MS-DOS device name, or (2) remotely injecting the device name into ASP programs that internally use Scripting.FileSystemObject.

Live · internet exposure

17 internet-exposed hosts are running an affected version of CVE-2001-1243 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)
5.0MEDIUMNVD never assigned a CVSS v3 rating to this CVE
EG Score
5.0(low)
EG Risk
53(Track)
EG Risk 53/100SSVC: 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
Severity50% × 45%
Exploitation65% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
50%
EPSS %ILE
99%
KEV
Not listed

Published

July 4, 2001

Last Modified

June 16, 2026

References (6)

Data Freshness Timeline

(refreshed 6× in last 7d / 12× 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 13:21 UTCEG score recompute▲ 5.00
  2. 2026-07-23 00:43 UTCEG score recompute
  3. 2026-07-23 00:25 UTCEG score recompute▼ 5.40
  4. 2026-07-22 23:48 UTCEG score recompute▲ 5.40
  5. 2026-07-22 21:28 UTCEG score recompute
  6. 2026-07-20 17:02 UTCEPSS rescore
  7. 2026-07-18 09:59 UTCEPSS rescore
  8. 2026-07-16 16:58 UTCEPSS rescore
  9. 2026-07-15 16:53 UTCEPSS rescore
  10. 2026-07-13 06:07 UTCEPSS rescore
  11. 2026-07-11 08:22 UTCEPSS rescore
  12. 2026-07-02 14:00 UTCEPSS rescore
  13. 2026-06-27 03:04 UTCEPSS rescore
  14. 2026-06-24 14:01 UTCEPSS rescore
  15. 2026-06-23 21:29 UTCEPSS rescore
  16. 2026-06-21 01:56 UTCEPSS rescore
  17. 2026-06-18 17:49 UTCEPSS rescore
  18. 2026-06-18 17:49 UTCEPSS rescore
  19. 2026-06-17 17:49 UTCEPSS rescore
  20. 2026-06-14 23:13 UTCEPSS rescore
  21. 2026-06-13 22:56 UTCEPSS rescore
  22. 2026-06-12 23:07 UTCEPSS rescore
  23. 2026-06-11 13:55 UTCEPSS rescore
  24. 2026-06-10 22:13 UTCEPSS rescore
  25. 2026-06-10 13:17 UTCEPSS rescore
Show 27 more
  1. 2026-06-07 15:21 UTCEPSS rescore
  2. 2026-06-06 13:44 UTCEPSS rescore
  3. 2026-06-04 13:09 UTCEPSS rescore
  4. 2026-06-02 20:10 UTCEPSS rescore
  5. 2026-06-01 13:48 UTCEPSS rescore
  6. 2026-05-31 22:27 UTCEPSS rescore
  7. 2026-05-31 20:31 UTCEG score recompute
  8. 2026-05-31 20:31 UTCGHSA enrichment
  9. 2026-05-31 00:13 UTCEPSS rescore
  10. 2026-05-31 00:13 UTCEPSS rescore
  11. 2026-05-29 13:40 UTCEPSS rescore
  12. 2026-05-28 13:42 UTCEPSS rescore
  13. 2026-05-28 13:42 UTCEPSS rescore
  14. 2026-05-28 13:42 UTCEPSS rescore
  15. 2026-05-28 13:42 UTCEPSS rescore
  16. 2026-05-27 13:37 UTCEPSS rescore
  17. 2026-05-27 13:37 UTCEPSS rescore
  18. 2026-05-26 07:16 UTCEPSS rescore
  19. 2026-05-26 07:16 UTCEPSS rescore
  20. 2026-05-24 16:42 UTCEPSS rescore
  21. 2026-05-22 21:15 UTCEPSS rescore
  22. 2026-05-21 22:38 UTCEPSS rescore
  23. 2026-05-20 22:36 UTCEPSS rescore
  24. 2026-05-20 11:20 UTCEPSS rescore
  25. 2026-05-20 11:20 UTCEPSS rescore
  26. 2026-05-18 21:29 UTCEPSS rescore
  27. 2026-05-18 21:29 UTCEPSS rescore

Publicly available exploits

(2 references)

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

  • Exploit-DBEDB-20989✓ verified
    First seen Jul 4, 2001

    Microsoft IIS 4.0/5.0 - Device File Local Denial of Service

    Open source ↗
  • Exploit-DBEDB-20991✓ verified
    First seen Jul 4, 2001

    Microsoft IIS 4.0/5.0 - Device File Remote Denial of Service

    Open source ↗

Frequently asked(4)

What is CVE-2001-1243?
CVE-2001-1243 is a medium vulnerability published on July 4, 2001. Scripting.FileSystemObject in asp.dll for Microsoft IIS 4.0 and 5.0 allows local or remote attackers to cause a denial of service (crash) via (1) creating an ASP program that uses Scripting.FileSystemObject to open a file with an MS-DOS device name, or (2) remotely injecting the device name into…
When was CVE-2001-1243 disclosed?
CVE-2001-1243 was first published in the National Vulnerability Database on July 4, 2001, with the most recent update on June 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2001-1243 actively exploited?
CVE-2001-1243 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 50% probability of exploitation in the next 30 days, which ranks it in the top 1.2% of all scored CVEs.
How do I remediate CVE-2001-1243?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2001-1243, 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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