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Fencer Vulns
medium 5.0

CVE-2001-0328 json

TCP implementations that use random increments for initial sequence numbers (ISN) can allow remote attackers to perform session hijacking o…

published 2001-05-24 25 y ago modified 2026-06-16 4 mo ago also EUVD-2001-0328

cvss
5.0
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
18.1%
EPSS 18.1% chance of exploitation in 30 days, percentile 97%
public exploits
1
Exploit-DB

Summary

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.

Patch / fix

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2001-0328 updated cvss 2.6

kernel: TCP connection ISN hijacks

  • Red Hat Enterprise Linux 5 kernel Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise MRG 2 kernel-rt, mrg-rt-release, kernel-rt-trace, kernel-rt-vanilla, kernel-rt-firmware
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Timeline

  1. First public exploit (EDB-19522)
  2. Published

Exploit prediction

18.13% chance of exploitation in the next 30 days, higher than 97% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • EDB-19522 Linux Kernel 2.2 - Predictable TCP Initial Sequence Number remote, 1999-09-27

CVSS scores

assigned by version score vector
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.