CVE-2001-0500
CVE-2001-0500 is a critical-severity vulnerability in Microsoft Index Server with a CVSS 2.0 base score of 10.0. Its EPSS exploit-prediction score of 97% places it in the 100th percentile, indicating an elevated likelihood of exploitation.
Key facts
- Severity: Critical (CVSS 2.0 base score 10.0)
- EPSS exploit prediction: 97% (100th percentile)
- Actively exploited: Not listed in CISA KEV
- Affected product: Microsoft Index Server
- Published:
- Last modified:
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.
Frequently asked questions
- What is 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 argument to Internet Data Administration (.ida) and Internet Data Query (.idq) files such as default.ida, as commonly exploited by Code Red.
- How severe is CVE-2001-0500?
- CVE-2001-0500 has a CVSS 2.0 base score of 10.0, rated critical severity.
- Is CVE-2001-0500 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 97% (100th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2001-0500?
- CVE-2001-0500 primarily affects Microsoft Index Server. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2001-0500?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
- When was CVE-2001-0500 published?
- CVE-2001-0500 was published on 2001-07-21 and last updated on 2026-06-16.
References
- http://www.cert.org/advisories/CA-2001-13.html
- http://www.ciac.org/ciac/bulletins/l-098.shtml
- http://www.iss.net/security_center/static/6705.php
- http://www.securityfocus.com/archive/1/191873
- http://www.securityfocus.com/bid/2880
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2001/ms01-033
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A197
Affected products (3)
- cpe:2.3:a:microsoft:index_server:2.0:*:*:*:*:*:*:*
- cpe:2.3:a:microsoft:indexing_service:*:*:windows_2000:*:*:*:*:*
- cpe:2.3:a:microsoft:internet_information_server:*:beta:*:*:*:*:*:*
More vulnerabilities in Microsoft Index Server
- CVE-1999-1011 — Critical (CVSS 10.0): The Remote Data Service (RDS) DataFactory component of Microsoft Data Access Components (MDAC) in IIS 3.x and 4.x…
- CVE-2001-0244 — High (CVSS 7.5): Buffer overflow in Microsoft Index Server 2.0 allows remote attackers to execute arbitrary commands via a long search…
- CVE-1999-1397 — High (CVSS 7.5): Index Server 2.0 on IIS 4.0 stores physical path information in the ContentIndex\Catalogs subkey of the AllowedPaths…
- CVE-2001-0986 — Medium (CVSS 5.0): SQLQHit.asp sample file in Microsoft Index Server 2.0 allows remote attackers to obtain sensitive information such as…
- CVE-2001-0245 — Medium (CVSS 5.0): Microsoft Index Server 2.0 in Windows NT 4.0, and Indexing Service in Windows 2000, allows remote attackers to read…
- CVE-2000-0302 — Medium (CVSS 5.0): Microsoft Index Server allows remote attackers to view the source code of ASP files by appending a %20 to the filename…