{"id":"CVE-2021-4209","revision":"6bf0ab2ba66f45489bfdb22885b26585","records":[{"revision":"6bf0ab2ba66f45489bfdb22885b26585","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2021-4209","aliases":[],"title":"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 cir…","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.","state":0,"publishedAt":"2022-08-24T15:07:31+00:00","modifiedAt":"2026-10-14T10:04:07.798+00:00","affected":[{"ecosystem":"Vendor product","name":"GnuTLS","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"GnuTLS\",\n                    \"vendor\": \"n/a\",\n                    \"versions\": [\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"Fixed in gnutls v3.7.3\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://gitlab.com/gnutls/gnutls/-/issues/1306","https://bugzilla.redhat.com/show_bug.cgi?id=2044156","https://access.redhat.com/security/cve/CVE-2021-4209","https://gitlab.com/gnutls/gnutls/-/merge_requests/1503","https://gitlab.com/gnutls/gnutls/-/commit/3db352734472d851318944db13be73da61300568","https://security.netapp.com/advisory/ntap-20220915-0005/"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2021-4209","license":"CVE Program Terms of Use","key":"cve-program:CVE-2021-4209","identifiers":["CVE-2021-4209"]},"retained":false,"historicalAffected":[]}],"coverage":[]}