CVE-2001-0288 json
Cisco switches and routers running IOS 12.1 and earlier produce predictable TCP Initial Sequence Numbers (ISNs), which allows remote attack…
published 2001-05-03 25 y ago modified 2026-06-16 4 mo ago also EUVD-2001-0288
- cvss
- 7.5
- version 2.0, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 5.4%
- EPSS 5.4% chance of exploitation in 30 days, percentile 92%
- public exploits
- 1
- Exploit-DB
Summary
Cisco switches and routers running IOS 12.1 and earlier produce predictable TCP Initial Sequence Numbers (ISNs), which allows remote attackers to spoof or hijack TCP connections.
Patch / fix
Timeline
- First public exploit (EDB-19522)
- Published
Exploit prediction
5.41% chance of exploitation in the next 30 days, higher than 92% 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 | 7.5 | AV:N/AC:L/Au:N/C:P/I:P/A:P |
Classification
- Technology feeds
References
-
cisco.com
/warp/public/707/ios-tcp-isn-random-pub.shtml
vendor-advisory, patch
Sources
- CVE List CVE-2001-0288
- NVD CVE-2001-0288
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.