Vulnerability Report

CVE-2001-0669

Title: IDS Unicode encoding bypass for HTTP attacks

Other

Proof Of Concept

PoC Available for CVE-2001-0669

CWE Category NVD-CWE-noinfo
Published Date Oct 30, 2001
Modified Date Jun 16, 2026
Exploit Status Available
Score 7.5 CVSS v2.0
Exploit Probability (EPSS)
4.39%

Vulnerability Summary

CVE-2001-0669: 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.

Impacted Vendors

C
cisco 3
E
enterasys 1
M
martin_roesch 1
I
information_security_systems 1
C
comodo 1
S
snort 1
I
iss 2

Reference Links

http://marc.info/?l=bugtraq&m=99972950200602&w=2 http://www.cisco.com/warp/public/707/cisco-intrusion-detection-obfuscation-vuln-pub.shtml http://www.kb.cert.org/vuls/id/548515 http://www.securityfocus.com/bid/3292 http://xforce.iss.net/alerts/advise95.php http://marc.info/?l=bugtraq&m=99972950200602&w=2 http://www.cisco.com/warp/public/707/cisco-intrusion-detection-obfuscation-vuln-pub.shtml http://www.kb.cert.org/vuls/id/548515 http://www.securityfocus.com/bid/3292 http://xforce.iss.net/alerts/advise95.php
CVSS v2.0
Source Entity [email protected]
Severity HIGH
7.5
Access Vector
N/A
Authentication
N/A
RAW VECTOR AV:N/AC:L/Au:N/C:P/I:P/A:P

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2001-0669 Exploits & PoCs (Proof Of Concept)

Exploit-DB https://www.exploit-db.com/exploits/21100
View Code
MODIFIED

Vulnerability data updated via NVD.

MODIFIED

Vulnerability data or affected products updated.

PUBLISHED

Vulnerability first announced in NVD.

Attack Vector Matrix

Access Vector N/A
Complexity N/A
Privileges N/A
Interaction NONE
CVSS Vector String AV:N/AC:L/Au:N/C:P/I:P/A:P

Affected Stack

No specific products linked.