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CVE-2003-1230
The implementation of SYN cookies (syncookies) in FreeBSD 4.5 through 5.0-RELEASE-p3 uses only 32-bit internal keys when generating…
Medium6.4EPSS 1.4%
- Published
- Updated
- Reserved
- Assigned by
- mitre
Description
The implementation of SYN cookies (syncookies) in FreeBSD 4.5 through 5.0-RELEASE-p3 uses only 32-bit internal keys when generating syncookies, which makes it easier for remote attackers to conduct brute force ISN guessing attacks and spoof legitimate traffic.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 2.0 | Medium6.4 | AV:N/AC:L/Au:N/C:P/I:P/A:N |
- EPSS (exploitation in 30 days)
- 1.4% · top 28% of all CVEs (2 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.4.
Weakness
- n/a
Affected products
n/a
- affected n/a
References (5)
- 19785 (opens in a new tab)vdb-entryx_refsource_OSVDBx_transferred
- freebsd-syncookie-brute-force(11397) (opens in a new tab)vdb-entryx_refsource_XFx_transferred
- 6920 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
- 8142 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
- FreeBSD-SA-03:03 (opens in a new tab)vendor-advisoryx_refsource_FREEBSDx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Record last updated .