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) v…

published 2001-07-04 25 y ago modified 2026-06-16 4 mo ago also EUVD-2001-1224

cvss: 5.0; version 2.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 70.5%; EPSS 70.5% chance of exploitation in 30 days, percentile 99.3%
public exploits: 2; Exploit-DB

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.

Patch / fix

links 1

securityfocus.com/bid/2973 advisory

Timeline

2001-07-04 First public exploit (EDB-20991)
2001-07-04 Published

Exploit prediction

70.50% chance of exploitation in the next 30 days, higher than 99.3% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

EDB-20991 Microsoft IIS 4.0/5.0 - Device File Remote Denial of Service dos, 2001-07-04
EDB-20989 Microsoft IIS 4.0/5.0 - Device File Local Denial of Service dos, 2001-07-04
securityfocus.com http://www.securityfocus.com/bid/2973 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	2.0	5.0	AV:N/AC:L/Au:N/C:N/I:N/A:P

References

securityfocus.com /bid/2973
vdb-entry, exploit, patch, vendor-advisory
iss.net /security_center/static/6800.php
vdb-entry, vendor-advisory
securityfocus.com /archive/1/194919
mailing-list

Sources

CVE List CVE-2001-1243
NVD CVE-2001-1243

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary