CVE-2000-0115

This issue is like a “bad pattern” that breaks the web server’s pattern-matching step in an ASP page. If someone can reach the server locally and feed it a malformed pattern, the server can crash and stop serving your website or app for everyone.

This matters if you run Internet Information Services with ASP enabled and you have pages/scripts that use Visual Basic pattern-matching with input that can be influenced by users. The findings describe it as requiring a local user (local access) rather than requiring no-access remote attackers.

Reachability gate: only a risk if an attacker has local access or can reach the service locally and the IIS/ASP pattern-matching code is reachable in your setup.

This is GREEN because the findings do not show confirmed exploitation in the wild, no public exploit, and no known fix/patch details—so it’s not currently clear you’re under active attack. However, the impact is a web server crash, so if you have any untrusted local access to your IIS/ASP system, you should address it as part of normal hardening.

Confirm exposure (practical checks):

• Verify your deployment: confirm Internet Information Services is installed and that ASP is enabled.
• Find the risky code path: locate ASP pages and included script files (VBScript) that perform pattern matching or regular-expression-like operations.
• Check input flow: determine whether the “pattern” content (or any string that becomes a pattern) can be influenced by request parameters, form fields, query strings, cookies, headers, or other user-controlled inputs.

If you find user-controlled pattern inputs:

• Implement a fix in code: validate that the pattern is well-formed before it is used for matching, and/or restrict acceptable patterns to an allow-list (for example, only allow specific known formats your app needs).
• Reject or safely handle invalid patterns: if the pattern fails validation, return an error page/message instead of letting the script attempt the invalid pattern.

If you cannot patch code immediately:

• Reduce exposure: restrict who can access the IIS server (network/firewall rules, remove unnecessary local access routes, and tighten access controls).
• Temporarily disable the specific ASP functionality that performs pattern matching, if that feature is not critical for operations.

Fix version / patch information:

• No fix/patch information was available in the findings for this CVE. That means remediation will likely require code changes (input validation) and/or configuration/access restrictions rather than upgrading to a known version.

What to monitor:

• Look for application/site crashes and restarts around times when the affected ASP endpoints are accessed.
• Review IIS logs for repeated requests that coincide with server instability and identify which inputs triggered failures.

Severity and type: This is a denial-of-service issue (web server availability) caused by invalid regular expressions used inside Visual Basic script within an ASP page.

Mechanism (how it’s triggered): A user supplies a malformed pattern that the VBScript/ASP logic attempts to use for pattern matching; handling of that invalid pattern causes the IIS web server to crash.

Exploit/exposure signals from the findings:

• No KEV listing.
• No public exploit code on record.
• Press attention is unknown.
• EPSS was predicted (and rising), but since exploitation confirmation is not present in the findings, treat this as “potentially reachable” rather than “confirmed active.”

Workarounds: Because no patch version is identified in the findings, mitigation focuses on validating/allow-listing pattern inputs in the affected ASP/VBScript code path and restricting access so untrusted users can’t reach the vulnerable endpoint locally.