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Status published
Medium
CVE-2021-4209
A NULL pointer dereference flaw was found in GnuTLS. As...
Vulnerability 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.
Impact Analysis
Refer to official advisory for detailed impact metrics.
Remediation
Ensure systems are updated to the latest vendor-supplied patch levels.
THREAT MONITOR
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Credits & Attribution
No credits recorded in the NVD database.
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/
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Affected Vendor
Affected Software
GnuTLS
Vulnerable Versions:
Fixed in gnutls v3.7.3
Timeline
Official Publish:
August 24th, 2022
Last Modified:
August 3rd, 2024
Added to House:
July 21st, 2026
CVSS Vectors
V3:
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H