CVE-2024-6640
MEDIUM EPSS 36.7%
Published Aug 12, 20241y ago · Modified Jun 17, 20261w ago
6.3 CVSS 3.1
Published Aug 12, 2024 1y ago
Last Modified Jun 17, 2026 1w ago
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.
CVSS Details
Base Score
Exploitability
Impact
Vector string
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L Attack Vector Network
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality Low
Integrity Low
Availability Low
Threat Intelligence
EPSS Exploit Probability
36.7% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available
Weaknesses 1
CWE-276
References 2
- security.freebsd.org https://security.freebsd.org/advisories/FreeBSD-SA-24:05.pf.asc
- security.netapp.com https://security.netapp.com/advisory/ntap-20240816-0008/
Remediation
No remediation data recorded yet
Check vendor advisories and the NVD entry for patch availability.