HIGH
Cisco switches and routers running CBOS 2.3.8 and earlier use predictable TCP Initial Sequence Numbers (ISN), which allows remote attackers to spoof or hijack TCP connections
Published Mar 9, 2002
7.5
HIGHCVSS 2.0
EPSS 2.61%
Description
Cisco switches and routers running CBOS 2.3.8 and earlier use predictable TCP Initial Sequence Numbers (ISN), which allows remote attackers to spoof or hijack 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.
2.61% 0.02615
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
EPSS probability 0.02615
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 (14 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 2.61% (0.02615) | 84.89th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.59% (0.02594) | 83.24th | v5 (v2026.06.15) |
| Jan 2, 2026 | 10.31% (0.10307) | 92.98th | v4 (v2025.03.14) |
| Mar 30, 2025 | 3.98% (0.03983) | 87.33th | v4 (v2025.03.14) |
| Mar 29, 2025 | 6.89% (0.06886) | 85.29th | v4 (v2025.03.14) |
| Mar 19, 2025 | 3.98% (0.03983) | 87.02th | v4 (v2025.03.14) |
| Mar 17, 2025 | 2.90% (0.02896) | 85.41th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.28% (0.00283) | 69.44th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.28% (0.00283) | 67.70th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.28% (0.00283) | 63.58th | 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)
- http://www.cisco.com/warp/public/707/CBOS-multiple2-pub.html vendor-advisoryx_refsource_CISCOPatchVendor Advisory
- https://exchange.xforce.ibmcloud.com/vulnerabilities/139 vdb-entryx_refsource_XF
| Link | Providers | Tags |
|---|---|---|
| http://www.cisco.com/warp/public/707/CBOS-multiple2-pub.html | vendor-advisoryx_refsource_CISCOPatchVendor Advisory | |
| https://exchange.xforce.ibmcloud.com/vulnerabilities/139 | vdb-entryx_refsource_XF |
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner mitre
Published Mar 9, 2002
Updated Aug 8, 2024
Reserved Oct 12, 2001
Link CVE-2001-0751
CISA Vulnrichment
Updated n/a