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Vulnerability Details CVE-2023-4809

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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 52.9%
CVSS Severity
CVSS v3 Score 7.5
Products affected by CVE-2023-4809


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