MEDIUM
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
Published Aug 17, 2005
6.4
MEDIUMCVSS 2.0
EPSS 1.35%
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.
Affected products
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
6.4 MEDIUM NVD
AV:N/AC:L/Au:N/C:P/I:P/A:N
Access Vector Network
Access Complexity Low
Authentication None
Confidentiality Impact Partial
Integrity Impact Partial
Availability Impact None
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
1.35% 0.01351
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
EPSS probability 0.01351
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (11 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 1.35% (0.01351) | 70.50th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.35% (0.01351) | 67.77th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.52% (0.00524) | 65.00th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.71% (0.00709) | 81.09th | v3 (v2023.03.01) |
| Jul 10, 2024 | 0.90% (0.00904) | 82.89th | v3 (v2023.03.01) |
| Dec 7, 2023 | 0.90% (0.00904) | 80.87th | v3 (v2023.03.01) |
| Mar 7, 2023 | 1.27% (0.01272) | 83.53th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.21% (0.01213) | 66.61th | v2 (v2022.01.01) |
| Feb 17, 2023 | 1.21% (0.01213) | 66.22th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.21% (0.01213) | 64.21th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.21% (0.01213) | 40.54th | v2 (v2022.01.01) |
Weaknesses (0)
No CWE recorded.
References (5)
- http://secunia.com/advisories/8142/ third-party-advisoryx_refsource_SECUNIAVendor Advisory
- http://www.osvdb.org/19785 vdb-entryx_refsource_OSVDB
- http://www.securityfocus.com/advisories/5013 vendor-advisoryx_refsource_FREEBSDPatchVendor Advisory
- http://www.securityfocus.com/bid/6920 vdb-entryx_refsource_BIDPatch
- https://exchange.xforce.ibmcloud.com/vulnerabilities/11397 vdb-entryx_refsource_XF
| Link | Providers | Tags |
|---|---|---|
| http://secunia.com/advisories/8142/ | third-party-advisoryx_refsource_SECUNIAVendor Advisory | |
| http://www.osvdb.org/19785 | vdb-entryx_refsource_OSVDB | |
| http://www.securityfocus.com/advisories/5013 | vendor-advisoryx_refsource_FREEBSDPatchVendor Advisory | |
| http://www.securityfocus.com/bid/6920 | vdb-entryx_refsource_BIDPatch | |
| https://exchange.xforce.ibmcloud.com/vulnerabilities/11397 | vdb-entryx_refsource_XF |
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner mitre
Published Aug 17, 2005
Updated Aug 8, 2024
Reserved Aug 17, 2005
Link CVE-2003-1230
CISA Vulnrichment
Updated n/a