Vulnerability Details : CVE-2021-4209
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.
Vulnerability category: Memory CorruptionDenial of service
Products affected by CVE-2021-4209
- cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
- cpe:2.3:a:gnu:gnutls:*:*:*:*:*:*:*:*
- cpe:2.3:a:netapp:active_iq_unified_manager:-:*:*:*:*:vmware_vsphere:*:*
- cpe:2.3:a:netapp:solidfire_\&_hci_management_node:-:*:*:*:*:*:*:*
- cpe:2.3:a:netapp:hci_bootstrap_os:-:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-4209
0.15%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 33 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-4209
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
6.5
|
MEDIUM | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
2.8
|
3.6
|
NIST |
CWE ids for CVE-2021-4209
-
The product dereferences a pointer that it expects to be valid but is NULL.Assigned by:
- nvd@nist.gov (Primary)
- secalert@redhat.com (Secondary)
References for CVE-2021-4209
-
https://gitlab.com/gnutls/gnutls/-/merge_requests/1503
wrap_nettle_hash_fast: avoid calling _update with zero-length input (!1503) · Merge requests · gnutls / GnuTLS · GitLabThird Party Advisory
-
https://gitlab.com/gnutls/gnutls/-/commit/3db352734472d851318944db13be73da61300568
wrap_nettle_hash_fast: avoid calling _update with zero-length input (3db35273) · Commits · gnutls / GnuTLS · GitLabPatch;Third Party Advisory
-
https://security.netapp.com/advisory/ntap-20220915-0005/
CVE-2021-4209 GnuTLS Vulnerability in NetApp Products | NetApp Product SecurityThird Party Advisory
-
https://access.redhat.com/security/cve/CVE-2021-4209
CVE-2021-4209- Red Hat Customer PortalThird Party Advisory
-
https://gitlab.com/gnutls/gnutls/-/issues/1306
Null pointer dereference in MD_UPDATE (#1306) · Issues · gnutls / GnuTLS · GitLabThird Party Advisory
-
https://bugzilla.redhat.com/show_bug.cgi?id=2044156
2044156 – (CVE-2021-4209) CVE-2021-4209 GnuTLS: Null pointer dereference in MD_UPDATEIssue Tracking;Third Party Advisory
Jump to