CVE-2020-13645

Name: CVE-2020-13645
Creator: NVD / NIST
Published: 2020-05-28T12:15:11.173+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 1.93%

Last modified Jun 17, 2026

CVE-2020-13645 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. In GNOME glib-networking through 2.64.2, the implementation of GTlsClientConnection skips hostname verification of the server's TLS certificate if the application fails to specify the expected server identity. This is in contrast to its intended documented behavior, to fail the certificate verification. EPSS estimates a 1.93% chance of exploitation in the next 30 days.

Description

In GNOME glib-networking through 2.64.2, the implementation of GTlsClientConnection skips hostname verification of the server's TLS certificate if the application fails to specify the expected server identity. This is in contrast to its intended documented behavior, to fail the certificate verification. Applications that fail to provide the server identity, including Balsa before 2.5.11 and 2.6.x before 2.6.1, accept a TLS certificate if the certificate is valid for any host.

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

1.93%

77.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-295

Affected Software

Vendor	Product	Versions
Gnome	Balsa	< 2.5.11
Gnome	Balsa	2.6.0
Gnome	Glib-Networking	< 2.62.4
Gnome	Glib-Networking	>= 2.64.0, < 2.64.3
Canonical	Ubuntu Linux	16.04
Canonical	Ubuntu Linux	18.04
Canonical	Ubuntu Linux	19.10
Canonical	Ubuntu Linux	20.04
Fedoraproject	Fedora	31
Fedoraproject	Fedora	32
Netapp	Cloud Backup	All versions
Broadcom	Fabric Operating System	All versions

References

https://gitlab.gnome.org/GNOME/balsa/-/issues/34Exploit, Vendor Advisory
https://gitlab.gnome.org/GNOME/glib-networking/-/issues/135Exploit, Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HLEX2IP62SU6WJ4SK3U766XGLQK3J62O/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LRCUM22YEWWKNMN2BP5LTVDM5P4VWIXS/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TQEQJQ4XFMFCFJTEXKL2ZO3UELBPCKSK/
https://security.gentoo.org/glsa/202007-50Third Party Advisory
https://security.netapp.com/advisory/ntap-20200608-0004/Third Party Advisory
https://usn.ubuntu.com/4405-1/Third Party Advisory
https://gitlab.gnome.org/GNOME/balsa/-/issues/34Exploit, Vendor Advisory
https://gitlab.gnome.org/GNOME/glib-networking/-/issues/135Exploit, Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HLEX2IP62SU6WJ4SK3U766XGLQK3J62O/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LRCUM22YEWWKNMN2BP5LTVDM5P4VWIXS/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TQEQJQ4XFMFCFJTEXKL2ZO3UELBPCKSK/
https://security.gentoo.org/glsa/202007-50Third Party Advisory
https://security.netapp.com/advisory/ntap-20200608-0004/Third Party Advisory
https://usn.ubuntu.com/4405-1/Third Party Advisory

Timeline

Published: May 28, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-13645?

How severe is CVE-2020-13645?

CVE-2020-13645 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 1.93% probability of exploitation in the next 30 days.

How do I fix CVE-2020-13645?

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-2020-13645?

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

Scan your code now

Source: NVD / NIST