🛡️ CVE-2023-4809
🟠 CVSS 7.5 — High ✅ No Known Exploit CWE-167 NVD
7.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

In pf packet processing with a 'scrub fragment reassemble' rule, a packet containing multiple IPv6 fragment headers would be reassembled, and then immediately processed. That is, a packet with multiple fragment extension headers would not be recognized as the correct ultimate payload. Instead a packet with multiple IPv6 fragment headers would unexpectedly be interpreted as a fragmented packet, rather than as whatever the real payload is. As a result, IPv6 fragments may bypass pf firewall rules written on the assumption all fragments have been reassembled and, as a result, be forwarded or processed by the host.

Details

Severity HIGH
CVSS Score 7.5
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CWE CWE-167
Public Exploit ✅ No
Source NVD
Published 2023-09-06
Updated 2026-06-08
Modified 2025-02-13
Fix URL N/A

Affected Packages

Software From version Fixed in
freebsd — —

References

Mailing List, Third Party Advisory http://www.openwall.com/lists/oss-security/2023/09/08/5
Mailing List, Third Party Advisory http://www.openwall.com/lists/oss-security/2023/09/08/6
Mailing List, Third Party Advisory http://www.openwall.com/lists/oss-security/2023/09/08/7
Mailing List, Third Party Advisory http://www.openwall.com/lists/oss-security/2023/09/08/5
Mailing List, Third Party Advisory http://www.openwall.com/lists/oss-security/2023/09/08/6
Mailing List, Third Party Advisory http://www.openwall.com/lists/oss-security/2023/09/08/7

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