CVE-2002-0813

Cisco IOS 11.1-11.3 - Heap-Based Buffer Overflow via TFTP Long Filename

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2002-0813. PoCs published by FX.

AI-analyzed exploit summary This is a proof-of-concept exploit for CVE-2002-0813, targeting a buffer overflow vulnerability in the TFTP server of Cisco IOS versions 11.1.x to 11.3.x. The exploit sends a maliciously crafted TFTP request with an overly long filename to trigger a heap overflow, potentially leading to remote code execution.

Description

Heap-based buffer overflow in the TFTP server capability in Cisco IOS 11.1, 11.2, and 11.3 allows remote attackers to cause a denial of service (reset) or modify configuration via a long filename.

Exploits (1)

exploitdb WORKING POC VERIFIED
by FX · cdoshardware
https://www.exploit-db.com/exploits/21655

This is a proof-of-concept exploit for CVE-2002-0813, targeting a buffer overflow vulnerability in the TFTP server of Cisco IOS versions 11.1.x to 11.3.x. The exploit sends a maliciously crafted TFTP request with an overly long filename to trigger a heap overflow, potentially leading to remote code execution.

Classification
Working Poc 95%
Attack Type
Rce
Complexity
Complex
Reliability
Racy
Target: Cisco IOS 11.1.x to 11.3.x
No auth needed
Prerequisites: Network access to the TFTP server on the target Cisco device · Knowledge of the stack address for the specific IOS build
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (6)

Core 6
Core References
Vendor Advisory mailing-list x_refsource_bugtraq
http://online.securityfocus.com/archive/1/284634
Patch, Vendor Advisory vendor-advisory x_refsource_cisco
http://www.cisco.com/warp/public/707/ios-tftp-long-filename-pub.shtml
Third Party Advisory vdb-entry x_refsource_xf
http://www.iss.net/security_center/static/9700.php
Mailing List mailing-list x_refsource_bugtraq
http://marc.info/?l=bugtraq&m=103002169829669&w=2
Third Party Advisory, VDB Entry vdb-entry x_refsource_bid
http://www.securityfocus.com/bid/5328
Third Party Advisory, VDB Entry vdb-entry x_refsource_osvdb
http://www.osvdb.org/854

Scores

EPSS 0.0909
EPSS Percentile 94.6%

Details

CWE
CWE-119
Status published
Products (3)
cisco/ios 11.1
cisco/ios 11.2
cisco/ios 11.3
Published Aug 12, 2002
Tracked Since Feb 18, 2026