CVE-2021-4209 Information

Description

A NULL pointer dereference flaw was found in GnuTLS. As Nettle’s hash update functions internally call memcpy providing zero-length input may cause undefined behavior. This flaw leads to a denial of service after authentication in rare circumstances.

Reference

https://gitlab.com/gnutls/gnutls/-/issues/1306 https://access.redhat.com/security/cve/CVE-2021-4209 https://gitlab.com/gnutls/gnutls/-/merge_requests/1503 https://bugzilla.redhat.com/show_bug.cgi?id=2044156 https://gitlab.com/gnutls/gnutls/-/commit/3db352734472d851318944db13be73da61300568