CVE-2001-0669
HighSummary
Various Intrusion Detection Systems (IDS), including Cisco Secure IDS and Snort, allow remote attackers to evade detection of HTTP attacks via non-standard '%u' Unicode encoding of ASCII characters in the requested URL.
Risk Assessment
Organizations using these IDS may be vulnerable to undetected HTTP attacks, potentially leading to serious security breaches.
Recommendation
It is recommended to update IDS to the latest versions that address this vulnerability and to monitor network traffic for unusual patterns.
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Original NVD description (English source)
Various Intrusion Detection Systems (IDS) including (1) Cisco Secure Intrusion Detection System, (2) Cisco Catalyst 6000 Intrusion Detection System Module, (3) Dragon Sensor 4.x, (4) Snort before 1.8.1, (5) ISS RealSecure Network Sensor 5.x and 6.x before XPU 3.2, and (6) ISS RealSecure Server Sensor 5.5 and 6.0 for Windows, allow remote attackers to evade detection of HTTP attacks via non-standard "%u" Unicode encoding of ASCII characters in the requested URL.