CVE-2023-1206

Name: CVE-2023-1206
Creator: NVD / NIST
Published: 2023-06-30T22:15:09.747+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.7/10EPSS 0.51%

Last modified Jun 17, 2026

CVE-2023-1206 is a medium-severity vulnerability rated 5.7/10 on the CVSS scale. A hash collision flaw was found in the IPv6 connection lookup table in the Linux kernel’s IPv6 functionality when a user makes a new kind of SYN flood attack. A user located in the local network or with a high bandwidth connection can increase the CPU usage of the server that accepts IPV6 connections up to 95%.. EPSS estimates a 0.51% chance of exploitation in the next 30 days.

Description

A hash collision flaw was found in the IPv6 connection lookup table in the Linux kernel’s IPv6 functionality when a user makes a new kind of SYN flood attack. A user located in the local network or with a high bandwidth connection can increase the CPU usage of the server that accepts IPV6 connections up to 95%.

Metrics

CVSS 3.1

5.7/10

CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

0.51%

39.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Linux	Linux Kernel	< 6.5
Redhat	Enterprise Linux	8.0
Redhat	Enterprise Linux	9.0
Fedoraproject	Fedora	38

References

Timeline

Published: Jun 30, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-1206?

How severe is CVE-2023-1206?

CVE-2023-1206 has a CVSS score of 5.7/10 (MEDIUM severity). The EPSS model estimates a 0.51% probability of exploitation in the next 30 days.

How do I fix CVE-2023-1206?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-1206?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST