Unrated severityNVD Advisory· Published Oct 30, 2001· Updated Jun 16, 2026
CVE-2001-0669
CVE-2001-0669
Description
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
13cpe:2.3:a:cisco:catalyst_6000_intrusion_detection_system_module:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:cisco:catalyst_6000_intrusion_detection_system_module:*:*:*:*:*:*:*:*
- (no CPE)
cpe:2.3:a:cisco:secure_intrusion_detection_system:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:cisco:secure_intrusion_detection_system:*:*:*:*:*:*:*:*
- (no CPE)
cpe:2.3:a:iss:realsecure_network_sensor:5.x:*:*:*:*:*:*:*+ 2 more
- cpe:2.3:a:iss:realsecure_network_sensor:5.x:*:*:*:*:*:*:*
- cpe:2.3:a:iss:realsecure_network_sensor:6.x:*:*:*:*:*:*:*
- (no CPE)range: >=5.x, <=6.x before XPU 3.2
cpe:2.3:a:iss:realsecure_server_sensor:5.5:*:*:*:*:*:*:*+ 2 more
- cpe:2.3:a:iss:realsecure_server_sensor:5.5:*:*:*:*:*:*:*
- cpe:2.3:a:iss:realsecure_server_sensor:6.0:*:*:*:*:*:*:*
- (no CPE)range: 5.5 and 6.0 for Windows
Patches
Vulnerability mechanics
References
5- www.cisco.com/warp/public/707/cisco-intrusion-detection-obfuscation-vuln-pub.shtmlnvdPatchVendor Advisory
- xforce.iss.net/alerts/advise95.phpnvdPatchVendor Advisory
- www.kb.cert.org/vuls/id/548515nvdUS Government Resource
- marc.infonvd
- www.securityfocus.com/bid/3292nvd
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