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Vulnerability record · CVE-2020-24659 · published 4 September 2020

CVE-2020-24659: Gnutls null pointer dereference vulnerability

Gnu · Gnutls

An issue was discovered in GnuTLS before 3.6.15. A server can trigger a NULL pointer dereference in a TLS 1.3 client if a no_renegotiation alert is sent with unexpected timing, and then an invalid second handshake occurs. The crash happens in the application's error handling path, where the gnutls_deinit function is called after detecting a handshake failure.

7.5 CVSS 3.1 High EPSS 3.7% · top 10.6% CWE-476 · NULL pointer dereferenceCWE-787 · Out-of-bounds write
7.5CVSS 3.1 base score, v2 5.0
3.7%EPSS exploitation probability, 30 days
NoNot in CISA KEV
4Affected product versions listed by NVD
18References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

An issue was discovered in GnuTLS before 3.6.15. A server can trigger a NULL pointer dereference in a TLS 1.3 client if a no_renegotiation alert is sent with unexpected timing, and then an invalid second handshake occurs. The crash happens in the application's error handling path, where the gnutls_deinit function is called after detecting a handshake failure.

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

Affected products

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

References

LinkTags
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00054.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00060.html Mailing ListThird Party Advisory
https://gitlab.com/gnutls/gnutls/-/issues/1071 ExploitIssue TrackingThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/62BUAI4FQQLG6VTKRT7SUZP
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AWN56FDLQQXT2D2YHNI4TYH
https://security.gentoo.org/glsa/202009-01 Third Party Advisory
https://security.netapp.com/advisory/ntap-20200911-0006/ Third Party Advisory
https://usn.ubuntu.com/4491-1/ Third Party Advisory
https://www.gnutls.org/security-new.html#GNUTLS-SA-2020-09-04 Vendor Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00054.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00060.html Mailing ListThird Party Advisory
https://gitlab.com/gnutls/gnutls/-/issues/1071 ExploitIssue TrackingThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/62BUAI4FQQLG6VTKRT7SUZP
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AWN56FDLQQXT2D2YHNI4TYH
https://security.gentoo.org/glsa/202009-01 Third Party Advisory
https://security.netapp.com/advisory/ntap-20200911-0006/ Third Party Advisory
https://usn.ubuntu.com/4491-1/ Third Party Advisory
https://www.gnutls.org/security-new.html#GNUTLS-SA-2020-09-04 Vendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2020-24659), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.