How severe is CVE-2001-0500?

No CVSS score has been assigned to CVE-2001-0500 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by CVE-2001-0500?

Affected package information for CVE-2001-0500 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2001-0500?

No fixed version has been published for CVE-2001-0500 yet. Monitor the advisory for updates, apply mitigations recommended by the vendor, and use O3 Security to track when a fix becomes available in your stack.

Is CVE-2001-0500 actively exploited in the wild?

Yes. There are 7 known exploit references for CVE-2001-0500, including 5 documented proof-of-concept exploits on Exploit-DB and 2 in-the-wild exploitations observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2001-0500?

CVE-2001-0500 has an EPSS (Exploit Prediction Scoring System) score of 90.2%, placing it in the 100th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. A score above 50% indicates significantly elevated exploitation risk — immediate patching is strongly recommended.

Which products and versions are affected by CVE-2001-0500?

CVE-2001-0500 affects microsoft index server (1 version, e.g. 2.0); microsoft indexing service; microsoft internet information server. Check the affected-products list on this page against your deployed version to confirm exposure.

When was CVE-2001-0500 published, and has it been updated?

CVE-2001-0500 was published on July 21, 2001 and was last updated on April 16, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CVE-2001-0500

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

Jul 21, 2001

Updated

Apr 16, 2026

Affected

0 pkgs

Patched

None yet

Exploits

7 known

EPSS Exploitation Probability

via FIRST.org ↗

90.2%probability of exploitation in next 30 days

Very High Risk100th percentile0.00%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

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

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

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-20931remotewindows✓ Verified

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

by hsj · Jun 21, 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-20930doswindows✓ Verified

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

by Ps0 · Jun 18, 2001

Exploit-DB Source

Frequently Asked Questions

O3 Security · Impact-Aware SCA

Is CVE-2001-0500 in your stack?

O3 detects CVE-2001-0500 across dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

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