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Vulnerability record · CVE-2000-0630 · published 17 July 2000

CVE-2000-0630: IIS .HTR handler allows remote source code fragment disclosure

Microsoft · Internet Information Server

IIS 4.0 and 5.0 permit remote attackers to retrieve fragments of server-side source code by appending '+.htr' to a URL. This is a variant of the 'File Fragment Reading via .HTR' flaw, and it matters because source disclosure can expose application logic, credentials or other sensitive data embedded in scripts.

5.0 CVSS 2.0 Medium EPSS 68% · top 0.7%
5.0CVSS 2.0 base score
68%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
6References
16 Jun 2026Last modified by NVD

Description

IIS 4.0 and 5.0 allows remote attackers to obtain fragments of source code by appending a +.htr to the URL, a variant of the "File Fragment Reading via .HTR" vulnerability.

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 19 September 2026. Confidence: medium.

medium priorityThe flaw is an unauthenticated remote information disclosure with high EPSS, but it only leaks source fragments and affects long-unsupported IIS versions.

What it is

IIS 4.0 and 5.0 permit remote attackers to retrieve fragments of server-side source code by appending '+.htr' to a URL. This is a variant of the 'File Fragment Reading via .HTR' flaw, and it matters because source disclosure can expose application logic, credentials or other sensitive data embedded in scripts.

Impact

An unauthenticated attacker gains partial disclosure of server-side source code, which can reveal sensitive implementation details and aid further attacks. The CVSS 2.0 vector rates confidentiality impact as partial with no integrity or availability impact.

Attack surface

Reachable over the network via HTTP by appending '+.htr' to a URL; 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 exploit tags appear in the references, but EPSS is high (0.68224, 99.3rd percentile), suggesting elevated likelihood of exploitation activity.

What to do

  • Apply Microsoft security bulletin MS00-044 or the corresponding IIS patch for the affected version.
  • Remove or disable the .HTR ISAPI handler mapping if it is not required.
  • Upgrade to a supported IIS release, as IIS 4.0 and 5.0 are long out of support.
  • Restrict external exposure of legacy IIS servers and place them behind a filtering reverse proxy.

Detection

  • Search web server logs for requests containing '+.htr' in the URL path.
  • Alert on .htr requests that return HTTP 200 with script-like content.
  • Monitor for repeated .htr probing from a single source IP.

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

Affected products

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

References

LinkTags
http://www.securityfocus.com/bid/1488
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2000/ms00-044
https://exchange.xforce.ibmcloud.com/vulnerabilities/5104
http://www.securityfocus.com/bid/1488
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2000/ms00-044
https://exchange.xforce.ibmcloud.com/vulnerabilities/5104

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Source: NIST National Vulnerability Database (record CVE-2000-0630), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.