CVE-2023-1668Network attack vector

Traffic interruption via unmasked IP protocol flows

Published Apr 10, 2023 · Updated Apr 23, 2025

Denial of service in affected Open vSwitch 1.5.0 through 3.1.0 releases allows remote attackers to interrupt traffic with IP protocol 0 packets. The ofproto translation layer treats nw_proto 0 as an absent network layer, omits required header-modification actions, and installs a wildcarded megaflow that captures other protocols. Exploitation requires qualifying set actions on other IP-header fields; matching traffic can then lose connectivity.

CVSS severity8.2
High
EPSS probability1.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in affected Open vSwitch 1.5.0 through 3.1.0 releases allows remote attackers to interrupt traffic with IP protocol 0 packets. The ofproto translation layer treats nw_proto 0 as an absent network layer, omits required header-modification actions, and installs a wildcarded megaflow that captures other protocols. Exploitation requires qualifying set actions on other IP-header fields; matching traffic can then lose connectivity.

The record

CVE
CVE-2023-1668
Published
Apr 10, 2023
Updated
Apr 23, 2025
Vendor
Open vSwitch
Product
Open vSwitch
Classifications
CWE-670, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 10, 2023CVE publishedPublication date reported by the CVE source.
  2. Apr 23, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unknown

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Open vSwitch · Open vSwitchversion=unknown

Published CVSS scores

8.2CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-670Always-Incorrect Control Flow Implementation
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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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