HIGH
FreeBSD 4.1.1 and earlier, and possibly other BSD-based OSes, uses an insufficient random number generator to generate initial TCP sequence numbers (ISN), which allows remote attackers to spoof TCP connections
Published Nov 29, 2000
7.5
HIGHCVSS 2.0
EPSS 5.55%
Description
FreeBSD 4.1.1 and earlier, and possibly other BSD-based OSes, uses an insufficient random number generator to generate initial TCP sequence numbers (ISN), which allows remote attackers to spoof TCP connections.
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.
7.5 HIGH NVD
AV:N/AC:L/Au:N/C:P/I:P/A:P
Access Vector Network
Access Complexity Low
Authentication None
Confidentiality Impact Partial
Integrity Impact Partial
Availability Impact Partial
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
5.55% 0.05547
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
EPSS probability 0.05547
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 (13 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 5.55% (0.05547) | 92.59th | v5 (v2026.06.15) |
| Jun 15, 2026 | 5.55% (0.05547) | 91.80th | v5 (v2026.06.15) |
| Jul 18, 2025 | 8.35% (0.08349) | 91.87th | v4 (v2025.03.14) |
| Mar 30, 2025 | 4.56% (0.04562) | 88.17th | v4 (v2025.03.14) |
| Mar 29, 2025 | 11.96% (0.11962) | 89.58th | v4 (v2025.03.14) |
| Mar 17, 2025 | 4.76% (0.04765) | 88.71th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.32% (0.00318) | 71.34th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.32% (0.00318) | 69.67th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.32% (0.00318) | 65.73th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.05% (0.01055) | 52.13th | v2 (v2022.01.01) |
| Sep 17, 2022 | 1.05% (0.01055) | 50.47th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.05% (0.01055) | 48.43th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.05% (0.01055) | 27.52th | v2 (v2022.01.01) |
Weaknesses (0)
No CWE recorded.
References (2)
- ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-00:52.tcp-iss.asc vendor-advisoryx_refsource_FREEBSDPatchVendor Advisory
- http://www.securityfocus.com/bid/1766 vdb-entryx_refsource_BIDPatchVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-00:52.tcp-iss.asc | vendor-advisoryx_refsource_FREEBSDPatchVendor Advisory | |
| http://www.securityfocus.com/bid/1766 | vdb-entryx_refsource_BIDPatchVendor Advisory |
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner mitre
Published Nov 29, 2000
Updated Aug 8, 2024
Reserved Nov 24, 2000
Link CVE-2000-0916
CISA Vulnrichment
Updated n/a