CVE-2003-0100

Cisco IOS 11.2.x-12.0.x - Denial of Service via OSPF Neighbor Announcements

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2003-0100. PoCs published by FX.

AI-analyzed exploit summary This exploit targets a buffer overflow in Cisco IOS OSPF handling (CVE-2003-0100) by sending malformed OSPF packets with more than 255 neighbors. It includes shellcode to write a configuration to NVRAM, achieving remote code execution on vulnerable Cisco routers.

Description

Buffer overflow in Cisco IOS 11.2.x to 12.0.x allows remote attackers to cause a denial of service and possibly execute commands via a large number of OSPF neighbor announcements.

Exploits (1)

exploitdb WORKING POC VERIFIED
by FX · cremotehardware
https://www.exploit-db.com/exploits/22271

This exploit targets a buffer overflow in Cisco IOS OSPF handling (CVE-2003-0100) by sending malformed OSPF packets with more than 255 neighbors. It includes shellcode to write a configuration to NVRAM, achieving remote code execution on vulnerable Cisco routers.

Classification
Working Poc 95%
Attack Type
Rce
Complexity
Complex
Reliability
Reliable
Target: Cisco IOS 11.2.x to 12.0.x
No auth needed
Prerequisites: Network access to vulnerable Cisco device · OSPF enabled on target
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (4)

Core 4
Core References
Vendor Advisory vdb-entry x_refsource_xf
http://www.iss.net/security_center/static/11373.php
Third Party Advisory, VDB Entry vdb-entry x_refsource_bid
http://www.securityfocus.com/bid/6895
Mailing List mailing-list x_refsource_bugtraq
http://marc.info/?l=bugtraq&m=104587206702715&w=2
Mailing List mailing-list x_refsource_bugtraq
http://marc.info/?l=bugtraq&m=104576100719090&w=2

Scores

EPSS 0.0963
EPSS Percentile 94.9%

Details

Status published
Products (50)
cisco/ios 11.1
cisco/ios 11.1\(7\)aa
cisco/ios 11.1\(7\)ca
cisco/ios 11.1\(9\)ia
cisco/ios 11.1\(13\)
cisco/ios 11.1\(13\)aa
cisco/ios 11.1\(13\)ca
cisco/ios 11.1\(13\)ia
cisco/ios 11.1\(15\)aa
cisco/ios 11.1\(15\)ca
... and 40 more
Published Mar 03, 2003
Tracked Since Feb 18, 2026