CVE-2021-4209

2022-08-2416:15:09

Debian Security Bug Tracker

security-tracker.debian.org

gnutls

null pointer dereference

denial of service

authentication

nettle's hash update

memcpy

unix

CVSS3

6.5

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

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

EPSS

0.002

Percentile

58.9%

JSON

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.

OSVersionArchitecturePackageVersionFilename
Debian12allgnutls28< 3.7.3-2gnutls28_3.7.3-2_all.deb
Debian11allgnutls28< 3.7.1-5+deb11u1gnutls28_3.7.1-5+deb11u1_all.deb
Debian999allgnutls28< 3.7.3-2gnutls28_3.7.3-2_all.deb
Debian13allgnutls28< 3.7.3-2gnutls28_3.7.3-2_all.deb

OS	Version	Architecture	Package	Version	Filename
Debian	12	all	gnutls28	< 3.7.3-2	gnutls28_3.7.3-2_all.deb
Debian	11	all	gnutls28	< 3.7.1-5+deb11u1	gnutls28_3.7.1-5+deb11u1_all.deb
Debian	999	all	gnutls28	< 3.7.3-2	gnutls28_3.7.3-2_all.deb
Debian	13	all	gnutls28	< 3.7.3-2	gnutls28_3.7.3-2_all.deb