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Vulnerability record · CVE-2020-25645 · published 13 October 2020

CVE-2020-25645: Linux kernel cleartext transmission vulnerability

Linux · Linux Kernel

A flaw was found in the Linux kernel in versions before 5.9-rc7. Traffic between two Geneve endpoints may be unencrypted when IPsec is configured to encrypt traffic for the specific UDP port used by the GENEVE tunnel allowing anyone between the two endpoints to read the traffic unencrypted. The main threat from this vulnerability is to data confidentiality.

7.5 CVSS 3.1 High EPSS 2.4% · top 16.4% CWE-319 · Cleartext transmission
7.5CVSS 3.1 base score, v2 5.0
2.4%EPSS exploitation probability, 30 days
NoNot in CISA KEV
7Affected product versions listed by NVD
16References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

A flaw was found in the Linux kernel in versions before 5.9-rc7. Traffic between two Geneve endpoints may be unencrypted when IPsec is configured to encrypt traffic for the specific UDP port used by the GENEVE tunnel allowing anyone between the two endpoints to read the traffic unencrypted. The main threat from this vulnerability is to data confidentiality.

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

Affected products

7 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00035.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00042.html Mailing ListThird Party Advisory
http://packetstormsecurity.com/files/161229/Kernel-Live-Patch-Security-Notice-LSN-0074-1.html Third Party AdvisoryVDB Entry
https://bugzilla.redhat.com/show_bug.cgi?id=1883988 ExploitIssue TrackingPatchVendor Advisory
https://lists.debian.org/debian-lts-announce/2020/10/msg00028.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2020/12/msg00027.html Mailing ListThird Party Advisory
https://security.netapp.com/advisory/ntap-20201103-0004/ Third Party Advisory
https://www.debian.org/security/2020/dsa-4774 Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00035.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00042.html Mailing ListThird Party Advisory
http://packetstormsecurity.com/files/161229/Kernel-Live-Patch-Security-Notice-LSN-0074-1.html Third Party AdvisoryVDB Entry
https://bugzilla.redhat.com/show_bug.cgi?id=1883988 ExploitIssue TrackingPatchVendor Advisory
https://lists.debian.org/debian-lts-announce/2020/10/msg00028.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2020/12/msg00027.html Mailing ListThird Party Advisory
https://security.netapp.com/advisory/ntap-20201103-0004/ Third Party Advisory
https://www.debian.org/security/2020/dsa-4774 Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2020-25645), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.