CVE-2001-0041

Cisco CatOS - Denial of Service via Failed Telnet Authentication Attempts

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2001-0041. PoCs published by blackangels.

AI-analyzed exploit summary This Perl script exploits a memory leak vulnerability in Cisco Catalyst telnet servers by repeatedly connecting to the service, causing memory depletion and a denial of service. It is part of the Cisco Global Exploiter toolkit, which includes multiple exploits for various Cisco vulnerabilities.

Description

Memory leak in Cisco Catalyst 4000, 5000, and 6000 series switches allows remote attackers to cause a denial of service via a series of failed telnet authentication attempts.

Exploits (1)

exploitdb WORKING POC VERIFIED
by blackangels · perldoshardware
https://www.exploit-db.com/exploits/20473

This Perl script exploits a memory leak vulnerability in Cisco Catalyst telnet servers by repeatedly connecting to the service, causing memory depletion and a denial of service. It is part of the Cisco Global Exploiter toolkit, which includes multiple exploits for various Cisco vulnerabilities.

Classification
Working Poc 90%
Attack Type
Dos
Complexity
Trivial
Reliability
Reliable
Target: Cisco Catalyst telnet server
No auth needed
Prerequisites: Network access to the target device · Telnet service running on the target
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (4)

Core 4
Core References
Patch, Vendor Advisory vendor-advisory x_refsource_cisco
http://www.cisco.com/warp/public/707/catalyst-memleak-pub.shtml
Patch, Vendor Advisory vdb-entry x_refsource_bid
http://www.securityfocus.com/bid/2072
Third Party Advisory, VDB Entry vdb-entry x_refsource_xf
https://exchange.xforce.ibmcloud.com/vulnerabilities/5656
Third Party Advisory, VDB Entry vdb-entry x_refsource_osvdb
http://www.osvdb.org/801

Scores

EPSS 0.1214
EPSS Percentile 95.6%

Details

CWE
CWE-399
Status published
Products (40)
cisco/catos 4.5\(2\)
cisco/catos 4.5\(3\)
cisco/catos 4.5\(4\)
cisco/catos 4.5\(5\)
cisco/catos 4.5\(6\)
cisco/catos 4.5\(7\)
cisco/catos 4.5\(8\)
cisco/catos 4.5\(9\)
cisco/catos 5.1
cisco/catos 5.1\(1\)
... and 30 more
Published Feb 16, 2001
Tracked Since Feb 18, 2026