CVE-2020-11501

gnutls: DTLS client hello contains a random value of all zeroes

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Severity

Moderate

Red Hat Product Security

7.4

CVSS 3.1

Review impact separately from score.

Published · March 27, 2020

Updated · October 14, 2026

Description

A cryptographic weakness was found in the way DLTS implementation of GnuTLS, used zeros in place of random numbers. This flaw can break the security guarantee of the DTLS protocol.

Statement

The earliest affected version is gnuTLS-3.6.3. Therefore versions of gnuTLS shipped with Red Hat Enterprise Linux 5, 6 and 7 are not affected by this flaw.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 7.4
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

CWE-327 · Use of a Broken or Risky Cryptographic Algorithm