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CVE-2024-6640pf incorrectly matches different ICMPv6 states in the state table

Description

In ICMPv6 Neighbor Discovery (ND), the ID is always 0. When pf is configured to allow ND and block incoming Echo Requests, a crafted Echo Request packet after a Neighbor Solicitation (NS) can trigger an Echo Reply. The packet has to come from the same host as the NS and have a zero as identifier to match the state created by the Neighbor Discovery and allow replies to be generated. ICMPv6 packets with identifier value of zero bypass firewall rules written on the assumption that the incoming packets are going to create a state in the state table.

Timeline

  1. ID reserved

    By freebsd

  2. · 32 days later

    Published

  3. · 4 months later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2024-6640, by who scored it
Scored byCVSSScoreVector
CISA-ADPADP (enrichment)3.1Medium6.3CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
NVDNVD · Deferred3.1Medium6.3CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
EPSS (exploitation in 30 days)
0.46% · top 59% of all CVEs (13 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.3.

Affected products

  • FreeBSD · FreeBSD

    • affected 14.1-RELEASE – < p3
    • affected 14.0-RELEASE – < p9
    • affected 13.3-RELEASE – < p5

References

References2

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .