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Vulnerability record · CVE-2000-0126 · published 26 January 2000

CVE-2000-0126: IIS IDQ Scripts Directory Traversal File Disclosure

Microsoft · Internet Information Server

Sample Internet Data Query (IDQ) scripts shipped with IIS 3 and 4 fail to properly filter '..' sequences, allowing directory traversal. A remote attacker can read files outside the intended web content directory. The flaw matters because it exposes server-side files to unauthenticated users over the network.

5.0 CVSS 2.0 Medium EPSS 46% · top 1.2%
5.0CVSS 2.0 base score
46%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
16 Jun 2026Last modified by NVD

Description

Sample Internet Data Query (IDQ) scripts in IIS 3 and 4 allow remote attackers to read files via a .. (dot dot) attack.

AV:N/AC:L/Au:N/C:P/I:N/A:N

Automated analysis

Generated by VULONE's analysis model from the NVD record, CISA KEV and EPSS data on 20 September 2026. Confidence: medium.

high priorityUnauthenticated remote file disclosure with a high EPSS percentile, though limited to read-only impact on legacy IIS.

What it is

Sample Internet Data Query (IDQ) scripts shipped with IIS 3 and 4 fail to properly filter '..' sequences, allowing directory traversal. A remote attacker can read files outside the intended web content directory. The flaw matters because it exposes server-side files to unauthenticated users over the network.

Impact

An attacker gains read access to files on the server that the web process can reach, potentially exposing configuration, script or data files. There is no integrity or availability impact per the CVSS vector.

Attack surface

Reachable over the network via HTTP requests to the affected IDQ scripts; the CVSS vector AV:N/AC:L/Au:N indicates no authentication and no user interaction are required.

Exploitation

Not listed in CISA KEV and no ransomware associations are recorded; EPSS is high (0.45661, 98.7th percentile), suggesting meaningful predicted exploitation activity, though the references carry no exploit tags.

What to do

  • Apply the vendor patch or upgrade to a supported IIS version, since IIS 3 and 4 are long end-of-life.
  • Remove or disable unused sample IDQ scripts from the web root.
  • Enforce strict input validation and path canonicalization on any remaining IDQ handling.
  • Restrict the web process account's file system read permissions to only required content.

Detection

  • Search web logs for requests to .idq files containing '..' or encoded traversal sequences.
  • Alert on IDQ requests returning 200 responses for paths outside the web root.
  • Monitor for anomalous file reads by the IIS worker process outside content directories.

This assessment is produced automatically and is not human-reviewed. Verify against the vendor advisory before acting on it.

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://exchange.xforce.ibmcloud.com/vulnerabilities/CVE-2000-0126
https://exchange.xforce.ibmcloud.com/vulnerabilities/CVE-2000-0126

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2000-0126), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.