CVE-2025-0650Public exploitNetwork attack vector

Egress ACL bypass via spoofed UDP source port

Published Jan 23, 2025 · Updated Nov 20, 2025

Improper access control in OVN allows remote attackers to bypass egress ACLs with crafted UDP packets from source port 53. The DNS-caching OUT_ACL flow matches udp.src == 53 without verifying that ovn-controller generated the packet. A logical switch must have DNS records and a direct or port-group to-lport ACL; successful bypass permits unauthorized traffic to protected virtual machines and containers.

CVSS severity8.1
High
EPSS probability0.86%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in OVN allows remote attackers to bypass egress ACLs with crafted UDP packets from source port 53. The DNS-caching OUT_ACL flow matches udp.src == 53 without verifying that ovn-controller generated the packet. A logical switch must have DNS records and a direct or port-group to-lport ACL; successful bypass permits unauthorized traffic to protected virtual machines and containers.

The record

CVE
CVE-2025-0650
Published
Jan 23, 2025
Updated
Nov 20, 2025
Vendor
389 Directory Server
Product
Fast Datapath for Red Hat Enterprise Linux
Classifications
CWE-284
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 23, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 20, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

389 Directory Server · Fast Datapath for Red Hat Enterprise LinuxAffected versions are unavailable in this record.
389 Directory Server · Red Hat OpenShift Container Platform 4Affected versions are unavailable in this record.

Published CVSS scores

8.1Red Hat, Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-284Improper Access Control

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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