← Vulnerability feed

Vulnerability record · CVE-2001-0669 · published 30 October 2001

CVE-2001-0669: Cisco catalyst 6000 intrusion detection system module vulnerability

Cisco · Catalyst 6000 Intrusion Detection System Module

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.

7.5 CVSS 2.0 High EPSS 4.4% · top 9.0%
7.5CVSS 2.0 base score
4.4%EPSS exploitation probability, 30 days
NoNot in CISA KEV
6Affected product versions listed by NVD
10References
16 Jun 2026Last modified by NVD

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.

AV:N/AC:L/Au:N/C:P/I:P/A:P

Affected products

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

References

LinkTags
http://marc.info/?l=bugtraq&m=99972950200602&w=2
http://www.cisco.com/warp/public/707/cisco-intrusion-detection-obfuscation-vuln-pub.shtml PatchVendor Advisory
http://www.kb.cert.org/vuls/id/548515 US Government Resource
http://www.securityfocus.com/bid/3292
http://xforce.iss.net/alerts/advise95.php PatchVendor Advisory
http://marc.info/?l=bugtraq&m=99972950200602&w=2
http://www.cisco.com/warp/public/707/cisco-intrusion-detection-obfuscation-vuln-pub.shtml PatchVendor Advisory
http://www.kb.cert.org/vuls/id/548515 US Government Resource
http://www.securityfocus.com/bid/3292
http://xforce.iss.net/alerts/advise95.php PatchVendor Advisory

Track CVE-2001-0669 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

7.5CVE-2004-0362ISS PAM ICQ Parsing Stack Buffer Overflows Allow Remote Code ExecutionThe ISS Protocol Analysis Module (PAM) used in RealSecure, Proventia and BlackICE products contains multiple stack-based buffer overflows in its ICQ …EPSS 73%analysed7.5CVE-2004-0193Iss blackice agent server vulnerabilityHeap-based buffer overflow in the ISS Protocol Analysis Module (PAM), as used in certain versions of RealSecure Network 7.0 and Server Sensor 7.0, Pr…EPSS 8.0%7.5CVE-2002-0237Iss blackice agent vulnerabilityBuffer overflow in ISS BlackICE Defender 2.9 and earlier, BlackICE Agent 3.0 and 3.1, and RealSecure Server Sensor 6.0.1 and 6.5 allow remote attacke…EPSS 3.7%5.0CVE-2006-3840Iss blackice pc protection vulnerabilityThe SMB Mailslot parsing functionality in PAM in multiple ISS products with XPU (24.39/1.78/epj/x.x.x.1780), including Proventia A, G, M, Server, and…EPSS 2.4%5.0CVE-2003-0702Iss realsecure server sensor vulnerabilityUnknown vulnerability in an ISAPI plugin for ISS Server Sensor 7.0 XPU 20.16, 20.18, and possibly other versions before 20.19, allows remote attacker…EPSS 2.8%

Source: NIST National Vulnerability Database (record CVE-2001-0669), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.