CVE-2021-20231

gnutls: The gnutls packages provide the GNU Transport Layer Security (GnuTLS) library, which implements cryptographic algorit...

CVE-2021-20231 is fixed in 13 products on 1 platform, first by gnutls-bin 3.6.13-2ubuntu1.6, released March 12, 2021. It is not reported as exploited. Patch Radar priority: High.

High
CVSS
9.8
Moderate
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0368
89th percentile

The gnutls packages provide the GNU Transport Layer Security (GnuTLS) library, which implements cryptographic algorithms and protocols such as SSL, TLS, and DTLS. Nettle is a cryptographic library that is designed to fit easily in almost any context: In crypto toolkits for object-oriented languages, such as C++, Python, or Pike, in applications like LSH or GNUPG, or even in kernel space. The following packages have been upgraded to a later upstream version: gnutls (3.6.16). (BZ#1956783) Security Fix(es): * nettle: Remote crash in RSA decryption via manipulated ciphertext (CVE-2021-3580) * gnutls: Use after free in client key_share extension (CVE-2021-20231) * gnutls: Use after free in client_send_params in lib/ext/pre_shared_key.c (CVE-2021-20232) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section. Additional Changes: For detailed information on changes in this release, see the Red Hat Enterprise Linux 8.5 Release Notes linked from the References section.

Where it's fixed

ProductFixed inFixReleased
Linux
gnutls · RHEL 8 0:3.6.16-4.el8 RHSA-2021:4451 Nov 9, 2021
gnutls · almalinux 8 3.6.16-4.el8 ALSA-2021:4451 Nov 9, 2021
gnutls · ol 8 0:3.6.16-4.el8 ELSA-2021-4451 Nov 16, 2021
gnutls · rocky 8 0:3.6.16-4.el8 RLSA-2021:4451 Nov 9, 2021
gnutls-bin · Ubuntu 20.04 LTS (focal) 3.6.13-2ubuntu1.6 gnutls-bin 3.6.13-2ubuntu1.6 Mar 12, 2021
gnutls-c++ · RHEL 8 0:3.6.16-4.el8 RHSA-2021:4451 Nov 9, 2021
gnutls-c++ · almalinux 8 3.6.16-4.el8 ALSA-2021:4451 Nov 9, 2021
gnutls-c++ · ol 8 0:3.6.16-4.el8 ELSA-2021-4451 Nov 16, 2021
gnutls-dane · RHEL 8 0:3.6.16-4.el8 RHSA-2021:4451 Nov 9, 2021
gnutls-dane · almalinux 8 3.6.16-4.el8 ALSA-2021:4451 Nov 9, 2021
gnutls-dane · ol 8 0:3.6.16-4.el8 ELSA-2021-4451 Nov 16, 2021
gnutls-devel · RHEL 8 0:3.6.16-4.el8 RHSA-2021:4451 Nov 9, 2021
gnutls-devel · almalinux 8 3.6.16-4.el8 ALSA-2021:4451 Nov 9, 2021
gnutls-devel · ol 8 0:3.6.16-4.el8 ELSA-2021-4451 Nov 16, 2021
gnutls-utils · RHEL 8 0:3.6.16-4.el8 RHSA-2021:4451 Nov 9, 2021
gnutls-utils · almalinux 8 3.6.16-4.el8 ALSA-2021:4451 Nov 9, 2021
gnutls-utils · ol 8 0:3.6.16-4.el8 ELSA-2021-4451 Nov 16, 2021
guile-gnutls · Ubuntu 20.04 LTS (focal) 3.6.13-2ubuntu1.6 guile-gnutls 3.6.13-2ubuntu1.6 Mar 12, 2021
libgnutls-dane0 · Ubuntu 20.04 LTS (focal) 3.6.13-2ubuntu1.6 libgnutls-dane0 3.6.13-2ubuntu1.6 Mar 12, 2021
libgnutls-openssl27 · Ubuntu 20.04 LTS (focal) 3.6.13-2ubuntu1.6 libgnutls-openssl27 3.6.13-2ubuntu1.6 Mar 12, 2021
libgnutls30 · Ubuntu 20.04 LTS (focal) 3.6.13-2ubuntu1.6 libgnutls30 3.6.13-2ubuntu1.6 Mar 12, 2021
libgnutlsxx28 · Ubuntu 20.04 LTS (focal) 3.6.13-2ubuntu1.6 libgnutlsxx28 3.6.13-2ubuntu1.6 Mar 12, 2021
nettle · RHEL 8 0:3.4.1-7.el8 RHSA-2021:4451 Nov 9, 2021
nettle · almalinux 8 3.4.1-7.el8 ALSA-2021:4451 Nov 9, 2021
nettle · ol 8 0:3.4.1-7.el8 ELSA-2021-4451 Nov 16, 2021
nettle · rocky 8 0:3.4.1-7.el8 RLSA-2021:4451 Nov 9, 2021
nettle-devel · RHEL 8 0:3.4.1-7.el8 RHSA-2021:4451 Nov 9, 2021
nettle-devel · almalinux 8 3.4.1-7.el8 ALSA-2021:4451 Nov 9, 2021
nettle-devel · ol 8 0:3.4.1-7.el8 ELSA-2021-4451 Nov 16, 2021

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