gnutls is vulnerable to denial of service (DoS). The vulnerability exists as 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 issue occurs where the gnutls_deinit function is called after detecting a handshake failure.
lists.opensuse.org/opensuse-security-announce/2020-10/msg00054.html
lists.opensuse.org/opensuse-security-announce/2020-10/msg00060.html
gitlab.com/gnutls/gnutls/-/issues/1071
lists.fedoraproject.org/archives/list/[email protected]/message/62BUAI4FQQLG6VTKRT7SUZPGJJ4NASQ3/
lists.fedoraproject.org/archives/list/[email protected]/message/AWN56FDLQQXT2D2YHNI4TYH432TDMQ7N/
security.gentoo.org/glsa/202009-01
security.netapp.com/advisory/ntap-20200911-0006/
usn.ubuntu.com/4491-1/
www.gnutls.org/security-new.html#GNUTLS-SA-2020-09-04