VULNERABILITY INTELLIGENCE

CVE-2021-4209

CVSS score6.5 MEDIUM
EPSS probability1.91%
CISA KEVNot currently listed
Published2022-08-24
Last modified2026-10-14
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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.

Weakness classification

  • secalert@redhat.com: CWE-476
  • nvd@nist.gov: CWE-476

Primary references