CVE-2020-1749

Name: CVE-2020-1749
Creator: NVD / NIST
Published: 2020-09-09T15:15:10.3+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.23%

Last modified Jun 17, 2026

CVE-2020-1749 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. A flaw was found in the Linux kernel's implementation of some networking protocols in IPsec, such as VXLAN and GENEVE tunnels over IPv6. When an encrypted tunnel is created between two hosts, the kernel isn't correctly routing tunneled data over the encrypted link; rather sending the data unencrypted. EPSS estimates a 1.23% chance of exploitation in the next 30 days.

Description

A flaw was found in the Linux kernel's implementation of some networking protocols in IPsec, such as VXLAN and GENEVE tunnels over IPv6. When an encrypted tunnel is created between two hosts, the kernel isn't correctly routing tunneled data over the encrypted link; rather sending the data unencrypted. This would allow anyone in between the two endpoints to read the traffic unencrypted. The main threat from this vulnerability is to data confidentiality.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

1.23%

65.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Linux	Linux Kernel	All versions
Redhat	Enterprise Linux	7.0
Redhat	Enterprise Mrg	2.0

References

https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-1749Issue Tracking, Patch, Third Party Advisory
https://security.netapp.com/advisory/ntap-20201222-0001/
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-1749Issue Tracking, Patch, Third Party Advisory
https://security.netapp.com/advisory/ntap-20201222-0001/

Timeline

Published: Sep 9, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-1749?

How severe is CVE-2020-1749?

CVE-2020-1749 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.23% probability of exploitation in the next 30 days.

How do I fix CVE-2020-1749?

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-2020-1749?

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

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Source: NVD / NIST