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TI-2024-06157 Aliases CVE-2024-6640GHSA-57cg-pmv4-v925

pf incorrectly matches different ICMPv6 states in the state table

Priority LOW 28CWE-276Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
Low · Low · Low
Fix status
Fixed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00462 40th percentileScored 2026-11-07
Fix Fixed FreeBSD (FreeBSD): p3, p9, p5

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
FreeBSDFreeBSD14.1-RELEASE to before p3; 14.0-RELEASE to before p9; 13.3-RELEASE to before p5p3, p9, p5Patch availableCNA
  • FreeBSD VendorFreeBSD Affected 14.1-RELEASE to before p3; 14.0-RELEASE to before p9; 13.3-RELEASE to before p5 Fixed in p3, p9, p5 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:o:freebsd:freebsd:*:*:*:*:*:*:*:*——FreeBSD
  • cpe:2.3:o:freebsd:freebsd:*:*:*:*:*:*:*:* Versions — — ·FreeBSD

Remediation

  • Fix · CNA FreeBSD (FreeBSD) Fixed in p3, p9, p5

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    FreeBSD p3, p5, p9

    4 records Highest priority Priority MEDIUM 1 MEDIUM, 3 LOW

    Other records, highest priority first

    • TI-2024-07034 OpenSSH pre-authentication async signal safety issuePriority MEDIUM 41
    • TI-2024-06267 ktrace(2) fails to detach when executing a setuid binaryPriority LOW 34
    • TI-2024-06266 NFS client accepts file names containing path separatorsPriority LOW 31
    Show all 4 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2024-6640
  2. 2026-10-03 Alias added: GHSA-57cg-pmv4-v925

References

Advisory 1

  • TI-2011-04182 Buffer overflow in libtelnet/encrypt.c in telnetd in FreeBSD 7.3 through 9.0, MIT… CVSS 2.0HIGH 10.0
  • TI-2007-03684 Integer overflow in print-bgp.c in the BGP dissector in tcpdump 3.9.6 and earlier allows… CVSS 3.1CRITICAL 9.8
  • TI-2002-00376 Integer overflow in xdr_array function in RPC servers for operating systems that use… CVSS 3.1CRITICAL 9.8
  • TI-2024-05929 Openssh: regresshion - race condition in ssh allows rce/dos CVSS 3.1HIGH 8.1
  • TI-2003-00437 Off-by-one error in the fb_realpath() function, as derived from the realpath function in… CVSS 3.1CRITICAL 9.8
  • TI-2003-00642 The prescan function in Sendmail 8.12.9 allows remote attackers to execute arbitrary code… CVSS 2.0HIGH 10.0
See all 611 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences