CVE-1999-0077

Windows NT - Predictable TCP Sequence Number Spoofing

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 2 public exploits for CVE-1999-0077. PoCs published by HORKimhab.

AI-analyzed exploit summary The repository contains only a markdown file with a placeholder for CVE-1999-0077, a vulnerability involving predictable TCP sequence numbers enabling IP spoofing. No functional exploit code, technical analysis, or proof-of-concept details are provided.

Description

Predictable TCP sequence numbers allow spoofing.

Exploits (2)

github STUB
by HORKimhab · shellpoc
https://github.com/HORKimhab/poc-cve-collection/tree/main/1999/0xxx/CVE-1999-0077.md

The repository contains only a markdown file with a placeholder for CVE-1999-0077, a vulnerability involving predictable TCP sequence numbers enabling IP spoofing. No functional exploit code, technical analysis, or proof-of-concept details are provided.

Classification
Stub 99%
Attack Type
Other
Complexity
Moderate
Reliability
Theoretical
Target: TCP/IP stacks (generic, no specific software/version listed)
No auth needed
Prerequisites: Network access to target · Ability to observe or predict TCP sequence numbers
mistral-large-3 · analyzed Jul 14, 2026 Full analysis →
exploitdb WRITEUP
remotelinux
https://www.exploit-db.com/exploits/19522

The vulnerability involves a weakness in the Linux kernel's TCP sequence number generation, specifically in the 'secure_tcp_sequence_number' function in 'drivers/char/random.c'. This flaw allows remote attackers to predict initial sequence numbers, facilitating TCP session spoofing and bypassing IP-based access controls.

Classification
Writeup 90%
Attack Type
Info Leak
Complexity
Moderate
Reliability
Theoretical
Target: Linux kernel (versions affected by CVE-1999-0077)
No auth needed
Prerequisites: Network access to the target system · Ability to observe or interact with TCP sessions
mistral-large-3 · analyzed Feb 19, 2026 Full analysis →

References (1)

Core 1
Core References
Third Party Advisory, VDB Entry vdb-entry x_refsource_xf
https://exchange.xforce.ibmcloud.com/vulnerabilities/139

Scores

EPSS 0.3087
EPSS Percentile 98.1%

Details

Status published
Products (1)
microsoft/windows_nt 4.0
Published Jan 01, 1995
Tracked Since Feb 18, 2026