Vulnerability CVE-2021-4209
Published: 2022-08-24

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.

 References:
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
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