CVE-2021-4209

MediumCVSS 6.5/10Last modified Oct 14, 2026

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.

Metrics

CVSS 3.1 6.5/10CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-476

Affected software

No affected versions have been published.

Timeline

Published
Aug 24, 2022
Last modified
Oct 14, 2026
NVD status
Modified

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CVE-2021-4209: Medium severity, CVSS 6.5 | Vulnix