CVE-2003-1306: Microsoft URLScan 2.5, with the RemoveServerHeader option enabled, allows remote attackers to obtain sensit...

Security readout for executives and security teams

This is an old information-disclosure issue in Microsoft URLScan 2.5. When configured to remove the Server header, some error responses can still reveal the web server name and version. That does not grant access by itself, but it can help attackers profile legacy IIS environments. Exposure is most likely in legacy Microsoft IIS deployments still using URLScan 2.5 with RemoveServerHeader enabled. Modern environments that no longer use URLScan 2.5 are unlikely to be affected based on the provided sources. Treat this as low urgency unless it identifies unsupported internet-facing infrastructure. The business concern is not immediate takeover, but attacker reconnaissance and evidence of obsolete web security controls. Mitigation focus: Inventory any remaining IIS systems using URLScan 2.5.; Check Microsoft or current vendor guidance for supported remediation.; Retire or replace unsupported URLScan 2.5 deployments where feasible..

Prepared

Jun 29, 2026, 10:06 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.