ipfw and ip6fw in FreeBSD 4.2 and earlier allows remote attackers to bypass access restrictions by setting the ECE flag in a TCP packet, which makes the packet appear to be part of an established connection
Published May 7, 2001
7.5
HIGHCVSS 2.0
EPSS 8.09%
Description
ipfw and ip6fw in FreeBSD 4.2 and earlier allows remote attackers to bypass access restrictions by setting the ECE flag in a TCP packet, which makes the packet appear to be part of an established connection.
Affected products
No data.
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
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.
AV:N/AC:L/Au:N/C:P/I:P/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
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 (10 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 8.09% (0.08094) | 94.65th | v5 (v2026.06.15) |
| Jun 15, 2026 | 8.09% (0.08094) | 94.07th | v5 (v2026.06.15) |
| Mar 30, 2025 | 8.91% (0.08911) | 91.76th | v4 (v2025.03.14) |
| Mar 29, 2025 | 13.10% (0.13104) | 90.15th | v4 (v2025.03.14) |
| Mar 17, 2025 | 8.91% (0.08911) | 91.94th | v4 (v2025.03.14) |
| Dec 12, 2024 | 2.66% (0.02657) | 90.77th | v3 (v2023.03.01) |
| Mar 7, 2023 | 2.66% (0.02657) | 88.73th | v3 (v2023.03.01) |
| Mar 6, 2023 | 6.79% (0.06790) | 92.15th | v2 (v2022.01.01) |
| Apr 1, 2022 | 6.79% (0.06790) | 91.41th | v2 (v2022.01.01) |
| Feb 4, 2022 | 6.79% (0.06790) | 79.54th | v2 (v2022.01.01) |
No CWE recorded.
References (6)
- ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-01:08.ipfw.asc vendor-advisoryx_refsource_FREEBSDPatchVendor Advisory
- http://www.ciac.org/ciac/bulletins/l-029.shtml third-party-advisorygovernment-resourcex_refsource_CIAC
- http://www.osvdb.org/1743 vdb-entryx_refsource_OSVDB
- http://www.security-express.com/archives/bugtraq/2001-01/0424.html mailing-listx_refsource_BUGTRAQ
- http://www.securityfocus.com/bid/2293 vdb-entryx_refsource_BIDExploitPatchVendor Advisory
- https://exchange.xforce.ibmcloud.com/vulnerabilities/5998 vdb-entryx_refsource_XF
| Link | Providers | Tags |
|---|---|---|
| ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-01:08.ipfw.asc | vendor-advisoryx_refsource_FREEBSDPatchVendor Advisory | |
| http://www.ciac.org/ciac/bulletins/l-029.shtml | third-party-advisorygovernment-resourcex_refsource_CIAC | |
| http://www.osvdb.org/1743 | vdb-entryx_refsource_OSVDB | |
| http://www.security-express.com/archives/bugtraq/2001-01/0424.html | mailing-listx_refsource_BUGTRAQ | |
| http://www.securityfocus.com/bid/2293 | vdb-entryx_refsource_BIDExploitPatchVendor Advisory | |
| https://exchange.xforce.ibmcloud.com/vulnerabilities/5998 | vdb-entryx_refsource_XF |
Change history (0)
No recorded changes yet.