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CVE-2001-0183
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,…
High7.5EPSS 8.1%
- Published
- Updated
- Reserved
- Assigned by
- mitre
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 2.0 | High7.5 | AV:N/AC:L/Au:N/C:P/I:P/A:P |
- EPSS (exploitation in 30 days)
- 8.1% · top 5.2% 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: High 7.5.
Weakness
- n/a
Affected products
n/a
- affected n/a
References (5)
- 2293 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
- L-029 (opens in a new tab)third-party-advisorygovernment-resourcex_refsource_CIACx_transferred
- 20010125 ecepass - proof of concept code for FreeBSD ipfw bypass (opens in a new tab)mailing-listx_refsource_BUGTRAQx_transferred
- ipfw-bypass-firewall(5998) (opens in a new tab)vdb-entryx_refsource_XFx_transferred
- 1743 (opens in a new tab)vdb-entryx_refsource_OSVDBx_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 .