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Vulnerability details: VCID-uws5-j79f-cbar
Vulnerability ID VCID-uws5-j79f-cbar
Aliases CVE-2021-20231
GNUTLS-SA-2021-03-10
Summary gnutls: Use after free in client key_share extension
Status Published
Exploitability 0.5
Weighted Severity 3.7
Risk 1.9
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-416 Use After Free
System Score Found at
cvssv3 3.7 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-20231.json
epss 0.00917 https://api.first.org/data/v1/epss?cve=CVE-2021-20231
epss 0.00917 https://api.first.org/data/v1/epss?cve=CVE-2021-20231
epss 0.00917 https://api.first.org/data/v1/epss?cve=CVE-2021-20231
epss 0.00917 https://api.first.org/data/v1/epss?cve=CVE-2021-20231
epss 0.00917 https://api.first.org/data/v1/epss?cve=CVE-2021-20231
epss 0.00917 https://api.first.org/data/v1/epss?cve=CVE-2021-20231
epss 0.00917 https://api.first.org/data/v1/epss?cve=CVE-2021-20231
epss 0.01195 https://api.first.org/data/v1/epss?cve=CVE-2021-20231
epss 0.01195 https://api.first.org/data/v1/epss?cve=CVE-2021-20231
epss 0.01195 https://api.first.org/data/v1/epss?cve=CVE-2021-20231
cvssv3.1 7.4 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
archlinux Low https://security.archlinux.org/AVG-1674
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-20231.json
https://api.first.org/data/v1/epss?cve=CVE-2021-20231
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-20231
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
1922276 https://bugzilla.redhat.com/show_bug.cgi?id=1922276
ASA-202103-1 https://security.archlinux.org/ASA-202103-1
AVG-1674 https://security.archlinux.org/AVG-1674
RHSA-2021:4451 https://access.redhat.com/errata/RHSA-2021:4451
USN-5029-1 https://usn.ubuntu.com/5029-1/
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-20231.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.75866
EPSS Score 0.00917
Published At April 1, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-04-01T14:02:48.849370+00:00 RedHat Importer Import https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-20231.json 38.0.0