Medium severity6.5NVD Advisory· Published Aug 24, 2022· Updated Jun 17, 2026
CVE-2021-4209
CVE-2021-4209
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
24- cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
- 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:-:*:*:*:*:*:*:*
- osv-coords18 versionspkg:rpm/suse/gnutls&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5pkg:rpm/suse/gnutls&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP5pkg:rpm/suse/gnutls&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP3pkg:rpm/suse/gnutls&distro=SUSE%20Linux%20Enterprise%20Micro%205.0pkg:rpm/suse/gnutls&distro=SUSE%20Linux%20Enterprise%20Micro%205.1pkg:rpm/suse/gnutls&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015-ESPOSpkg:rpm/suse/gnutls&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015-LTSSpkg:rpm/suse/gnutls&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP1-ESPOSpkg:rpm/suse/gnutls&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP1-LTSSpkg:rpm/suse/gnutls&distro=SUSE%20Linux%20Enterprise%20Server%2015-LTSSpkg:rpm/suse/gnutls&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP1-BCLpkg:rpm/suse/gnutls&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP1-LTSSpkg:rpm/suse/gnutls&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015pkg:rpm/suse/gnutls&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP1pkg:rpm/suse/gnutls&distro=SUSE%20Linux%20Enterprise%20Real%20Time%2015%20SP2pkg:rpm/opensuse/gnutls&distro=openSUSE%20Leap%2015.3pkg:rpm/suse/gnutls&distro=SUSE%20Linux%20Enterprise%20Software%20Development%20Kit%2012%20SP5pkg:rpm/suse/gnutls&distro=SUSE%20Enterprise%20Storage%206
< 3.3.27-3.6.1+ 17 more
- (no CPE)range: < 3.3.27-3.6.1
- (no CPE)range: < 3.3.27-3.6.1
- (no CPE)range: < 3.6.7-14.16.1
- (no CPE)range: < 3.6.7-14.16.1
- (no CPE)range: < 3.6.7-14.16.1
- (no CPE)range: < 3.6.7-150000.6.45.2
- (no CPE)range: < 3.6.7-150000.6.45.2
- (no CPE)range: < 3.6.7-150000.6.45.2
- (no CPE)range: < 3.6.7-150000.6.45.2
- (no CPE)range: < 3.6.7-150000.6.45.2
- (no CPE)range: < 3.6.7-150000.6.45.2
- (no CPE)range: < 3.6.7-150000.6.45.2
- (no CPE)range: < 3.6.7-150000.6.45.2
- (no CPE)range: < 3.6.7-150000.6.45.2
- (no CPE)range: < 3.6.7-14.16.1
- (no CPE)range: < 3.6.7-14.16.1
- (no CPE)range: < 3.3.27-3.6.1
- (no CPE)range: < 3.6.7-150000.6.45.2
Patches
Vulnerability mechanics
References
6- gitlab.com/gnutls/gnutls/-/commit/3db352734472d851318944db13be73da61300568nvdPatchThird Party Advisory
- access.redhat.com/security/cve/CVE-2021-4209nvdThird Party Advisory
- bugzilla.redhat.com/show_bug.cginvdIssue TrackingThird Party Advisory
- gitlab.com/gnutls/gnutls/-/issues/1306nvdThird Party Advisory
- gitlab.com/gnutls/gnutls/-/merge_requests/1503nvdThird Party Advisory
- security.netapp.com/advisory/ntap-20220915-0005/nvdThird Party Advisory
News mentions
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