Is CVE-2021-20231 in the CISA KEV catalog?

No. CVE-2021-20231 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-20231?

CVE-2021-20231 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2021-20231?

CVE-2021-20231 has an EPSS score of 3.75% (89th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-20231?

Upgrade gnutls28 on debian 11 to 3.7.1-1 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2021-20231

CRITICALEPSS 89th pctl

9.8

CVSS v3

NVD

Description

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

CWE-416Use After Free

How to fix

Remediation Available

gnutls28Debian

Fixed in:3.7.1-1CVE-2021-20231

gnutls28Ubuntu

Fixed in:3.6.13-2ubuntu1.6USN-5029-1

libgnutls30Ubuntu

Fixed in:3.6.13-2ubuntu1.6USN-5029-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

3.75%probability of exploitation in 30 days

89thpercentile

Elevated risk: more likely to be exploited than 89% of all known CVEs.

References

Patch1

bugzilla.redhat.com

Exploit1

gnutls.org

Third-Party Advisory1

security.netapp.com

Other references9

Related Vulnerabilities

Other CWE-416 (Use After Free) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2019-0708	Critical	9.8	100%	KEV + Ransom	-
CVE-2021-31166	Critical	9.8	100%	KEV	Fix
CVE-2015-5119	Critical	9.8	99%	KEV	-
CVE-2010-3962	High	8.1	97%	KEV	-
CVE-2015-0313	Critical	9.8	96%	KEV	Fix
CVE-2017-9798	High	7.5	95%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.