NULL pointer dereference in Gnu Gnutls
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 ci…
EPSS: 0.014 (69.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Gnu Gnutls
- Netapp Active_iq_unified_manager
- Netapp Hci_bootstrap_os
- Netapp Hci_compute_node
- Netapp Solidfire_\&_hci_management_node
- Redhat Enterprise_linux — versions 8.0
- N/a Gnutls — versions Fixed in gnutls v3.7.3
Weakness classification (CWE)
Public proof-of-concept exploits
References
- secalert@redhat.com (Third Party Advisory, x_refsource_MISC)
- secalert@redhat.com (Third Party Advisory, x_refsource_MISC, Issue Tracking)
- secalert@redhat.com (Third Party Advisory, x_refsource_MISC)
- secalert@redhat.com (Third Party Advisory, x_refsource_MISC)
- secalert@redhat.com (Patch, Third Party Advisory, x_refsource_MISC)
- secalert@redhat.com (x_refsource_CONFIRM, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-4209?
- CVE-2021-4209 is a medium-severity vulnerability in Gnu Gnutls, classified under NULL Pointer Dereference. CVSS score: 6.5/10. Published 2022-08-24.
- How severe is CVE-2021-4209?
- Medium severity. CVSS v3 base score is 6.5 out of 10.
- Is CVE-2021-4209 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.