🛡️ CVE-2024-6640
🟡 CVSS 6.3 — Medium ✅ No Known Exploit CWE-276 NVD
6.3
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

Details

Severity MEDIUM
CVSS Score 6.3
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
CWE CWE-276
Public Exploit ✅ No
Source NVD
Published 2024-08-12
Updated 2026-06-02
Modified 2026-04-15
Fix URL N/A

Affected Packages

Software From version Fixed in
unknown — —

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