CVE-2001-0328

TCP Implementations - Session Hijacking or Disruption via ISN Flooding

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2001-0328.

AI-analyzed exploit summary The vulnerability in the Linux kernel's 'secure_tcp_sequence_number' function allows remote users to predict TCP initial sequence numbers (ISNs) due to weak MD4-based generation, enabling session spoofing and bypassing IP-based access controls. The analysis references the specific function and file in the kernel code.

Description

TCP implementations that use random increments for initial sequence numbers (ISN) can allow remote attackers to perform session hijacking or disruption by injecting a flood of packets with a range of ISN values, one of which may match the expected ISN.

Exploits (1)

exploitdb WRITEUP
remotelinux
https://www.exploit-db.com/exploits/19522

The vulnerability in the Linux kernel's 'secure_tcp_sequence_number' function allows remote users to predict TCP initial sequence numbers (ISNs) due to weak MD4-based generation, enabling session spoofing and bypassing IP-based access controls. The analysis references the specific function and file in the kernel code.

Classification
Writeup 90%
Attack Type
Info Leak
Complexity
Moderate
Reliability
Theoretical
Target: Linux kernel (versions affected by CVE-2001-0328)
No auth needed
Prerequisites: Network access to the target system · Ability to observe or predict TCP sequence numbers
devstral-2 · analyzed Feb 19, 2026 Full analysis →

References (8)

Core 8
Core References
Third Party Advisory third-party-advisory x_refsource_secunia
http://secunia.com/advisories/8044
Third Party Advisory, VDB Entry vdb-entry x_refsource_sectrack
http://www.securitytracker.com/id/1033181
Third Party Advisory, VDB Entry vdb-entry signature x_refsource_oval
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A4922
Third Party Advisory, VDB Entry vdb-entry x_refsource_bid
http://www.securityfocus.com/bid/2682
Patch, Third Party Advisory, US Government Resource third-party-advisory x_refsource_cert
http://www.cert.org/advisories/CA-2001-09.html
Vendor Advisory vendor-advisory x_refsource_sgi
ftp://patches.sgi.com/support/free/security/advisories/20030201-01-P
Third Party Advisory third-party-advisory x_refsource_sreason
http://securityreason.com/securityalert/57

Scores

EPSS 0.1812
EPSS Percentile 96.8%

Details

Status published
Published Jun 27, 2001
Tracked Since Feb 18, 2026