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CVE-2001-0500 — Microsoft

CVE-2001-0500 is a remote code execution vulnerability. 7 public exploit references exist, so weaponization risk is real. No vendor fix is recorded yet; mitigation options are listed below.

Buffer overflow in ISAPI extension (idq.dll) in Index Server 2.0 and Indexing Service 2000 in IIS 6.0 beta and earlier allows remote attackers to execute arbitrary commands via a long…

Published
Updated
Affected
3 products
Patched
See advisory
Exploits
7 known
Exploitation data as of Oct 21, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
96.7%probability of exploitation in next 30 days
Very High Risk+0.06%
Lower risk than most CVEs100th percentile — riskier than 100% of all scored CVEsHighest risk
88.2%91.7%95.2%98.7%90.7%96.7%Apr 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

Description

Buffer overflow in ISAPI extension (idq.dll) in Index Server 2.0 and Indexing Service 2000 in IIS 6.0 beta and earlier allows remote attackers to execute arbitrary commands via a long argument to Internet Data Administration (.ida) and Internet Data Query (.idq) files such as default.ida, as commonly exploited by Code Red.

Affected Products

3 products · 3 configurations
Application
index servermicrosoft
1 version
2.0
Application
indexing servicemicrosoft
all
Application
internet information servermicrosoft
≤ 6.0
range
Exploits & PoCs
7

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

EDB-20930doswindows✓ Verified

Microsoft Index Server 2.0 / Indexing Service (Windows 2000) - ISAPI Extension Buffer Overflow (PoC)

by Ps0 · Jun 18, 2001

Exploit-DB Source
EDB-20932remotewindows✓ Verified

Microsoft Index Server 2.0 / Indexing Service (Windows 2000) - ISAPI Extension Buffer Overflow (3)

by mat · Jun 18, 2001

Exploit-DB Source
EDB-20933remotewindows✓ Verified

Microsoft Index Server 2.0 / Indexing Service (Windows 2000) - ISAPI Extension Buffer Overflow (4)

by blackangels · Jun 18, 2001

Exploit-DB Source
EDB-16472remotewindows✓ Verified

Microsoft IIS 5.0 - IDQ Path Overflow (MS01-033) (Metasploit)

by Metasploit · Jun 15, 2010

Exploit-DB Source
EDB-20931remotewindows✓ Verified

Microsoft Index Server 2.0 / Indexing Service (Windows 2000) - ISAPI Extension Buffer Overflow (2)

by hsj · Jun 21, 2001

Exploit-DB Source

Detection & mitigation playbook

Vulnerability

  1. Detect

    Identify every host running the affected component and compare the installed build against the fixed version below — for source-built or distro-packaged software the version string, not a lockfile, is the source of truth (`dpkg -l`, `rpm -q`, or the binary's own `--version`).

  2. Remediation status

    No fixed release is recorded for CVE-2001-0500 yet. Track the upstream advisory, and apply the exposure-reduction steps below in the meantime.

  3. Mitigate without a patch

    Constrain what reaches the vulnerable code: limit the size and shape of untrusted input, isolate the affected component in a sandboxed or least-privileged process, and enable the platform's memory-safety mitigations (ASLR, stack protector, hardened allocator) so an out-of-bounds access is more likely to fail closed than to be exploitable.

Frequently Asked Questions

Buffer overflow in ISAPI extension (idq.dll) in Index Server 2.0 and Indexing Service 2000 in IIS 6.0 beta and earlier allows remote attackers to execute arbitrary commands via a long argument to Internet Data Administration (.ida) and Internet Data Query (.idq) files such as default.ida, as commonly exploited by Code Red.
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CVE-2001-0500: Microsoft Memory Corruption