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CVE-2021-4209

Published: 22 February 2022

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.

Priority

Low

Cvss 3 Severity Score

6.5

Score breakdown

Status

Package Release Status
gnutls26
Launchpad, Ubuntu, Debian
focal Does not exist

groovy Does not exist

hirsute Does not exist

impish Does not exist

kinetic Does not exist

lunar Does not exist

trusty Needs triage

upstream Needs triage

xenial Does not exist

bionic Does not exist

cosmic Does not exist

disco Does not exist

eoan Does not exist

jammy Does not exist

mantic Does not exist

gnutls28
Launchpad, Ubuntu, Debian
bionic
Released (3.5.18-1ubuntu1.6)
focal
Released (3.6.13-2ubuntu1.7)
impish Ignored
(end of life)
kinetic Not vulnerable
(3.7.6-2ubuntu1)
lunar Not vulnerable
(3.7.6-2ubuntu1)
upstream
Released (3.7.3)
xenial
Released (3.4.10-4ubuntu1.9+esm1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
trusty Ignored
(end of standard support)
jammy Not vulnerable
(3.7.3-4ubuntu1)
mantic Not vulnerable
(3.7.6-2ubuntu1)
Patches:
upstream: https://gitlab.com/gnutls/gnutls/-/commit/3db352734472d851318944db13be73da61300568

Severity score breakdown

Parameter Value
Base score 6.5
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H