Ovn: egress acls may be bypassed via specially crafted udp packet

Summary

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.

Timeline

1. Jan 23, 2025, 4:34 PM UTCCVE published
2. Jan 23, 2025, 5:00 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: total

3. Nov 20, 2025, 7:25 AM UTCRecord last updated

Affected versions

• 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

References 18