CVE-2021-20231

gnutls: Use after free in client key_share extension

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Severity

Moderate

Red Hat Product Security

3.7

CVSS 3.1

Review impact separately from score.

Published · March 12, 2021

Updated · October 14, 2026

Description

A flaw was found in gnutls. A use after free issue in client sending key_share extension may lead to memory corruption and denial of service.

Statement

As mentioned in the upstream advisory and GnuTLS issue 1151 (see External References) this flaw is not easily exploitable and it only happens intermittently (denial of service is not always practical). For this reason, this flaw has been rated as having a security impact of Moderate.

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 · 3.7
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

CWE-416 · Use After Free