What is CVE-2023-1668?

CVE-2023-1668 is a high-severity vulnerability in Cloudbase Open Vswitch, classified under Always-Incorrect Control Flow Implementation. CVSS score: 8.2/10. Published 2023-04-10.

How severe is CVE-2023-1668?

High severity. CVSS v3 base score is 8.2 out of 10.

Is CVE-2023-1668 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Cloudbase Open Vswitch

CVE-2023-1668

A flaw was found in openvswitch (OVS). When processing an IP packet with protocol 0, OVS will install the datapath flow without the action modifying the IP header. This issue results (for both kernel and userspace datapath) in installing a datapath flow matching all IP protocols (nw_proto is wildcarded) for this flow, but with an incorrect action, possibly causing incorrect handling of other IP packets with a != 0 IP protocol that matches this dp flow.

Published 2023-04-10 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H.

EPSS exploit prediction

EPSS: 0.012 (68.6th percentile), scored 2026-11-01.

Low probability of exploitation in the next 30 days, but still tracked. 69th percentile — 68.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000

Affected products

Cloudbase Open Vswitch — versions 3.1.0
Debian Linux — versions 11.0
Red Hat Enterprise Linux — versions 7.0, 8.0
Red Hat Fast Datapath
Red Hat Openshift Container Platform — versions 4.0
Red Hat OpenStack Platform — versions 16.1, 16.2, 17.0
Red Hat Virtualization — versions 4.0
Openvswitch

Weakness classification (CWE)

CWE-670 — Always-Incorrect Control Flow Implementation

Public proof-of-concept exploits

References

bugzilla.redhat.com/show_bug.cgi (Third Party Advisory, Issue Tracking)
www.openwall.com/lists/oss-security/2023/04/06/1 (Patch, Mailing List, Mitigation)
www.debian.org/security/2023/dsa-5387 (vendor-advisory, Third Party Advisory)
lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
lists.debian.org/debian-lts-announce/2023/05/msg00000.html (mailing-list)
security.gentoo.org/glsa/202311-16 (vendor-advisory)

Frequently asked questions

What is CVE-2023-1668?: CVE-2023-1668 is a high-severity vulnerability in Cloudbase Open Vswitch, classified under Always-Incorrect Control Flow Implementation. CVSS score: 8.2/10. Published 2023-04-10.
How severe is CVE-2023-1668?: High severity. CVSS v3 base score is 8.2 out of 10.
Is CVE-2023-1668 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.