SARA / Free Tools / CVE / CVE-2023-4809

CVE-2023-4809 — In pf packet processing with a 'scrub fragment reassemble' rule, a packet contai

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 ul

CVSS
— —
EPSS
0.47% (top 35.50%)
CWE
CWE-167
Published
2023-09-06T19:26:45.833Z
Last modified
2025-02-13T17:18:10.982Z
CVSS vector
—

01What is this vulnerability?

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…

02Affected products

VendorProductVersions
FreeBSDFreeBSD13.2-RELEASE, 12.4-RELEASE

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

09References

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