Is CVE-2021-3563 in the CISA KEV catalog?

No. CVE-2021-3563 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-3563?

CVE-2021-3563 has a CVSS v3 base score of 7.4 (HIGH).

What is the EPSS score for CVE-2021-3563?

CVE-2021-3563 has an EPSS score of 1.32% (67th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-3563?

Upgrade keystone on debian 13 to 2:23.0.0-3 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2021-3563

HIGH

7.4

CVSS v3

NVD

Description

A flaw was found in openstack-keystone. Only the first 72 characters of an application secret are verified allowing attackers bypass some password complexity which administrators may be counting on. The highest threat from this vulnerability is to data confidentiality and integrity.

CWE-863Incorrect Authorization

How to fix

Remediation Available

keystoneDebian

Fixed in:2:23.0.0-3CVE-2021-3563

keystoneUbuntu

Fixed in:2:21.0.1-0ubuntu2.1USN-7926-1

python3-keystoneUbuntu

Fixed in:2:21.0.1-0ubuntu2.1USN-7926-1

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 ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityNone

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

Exploit Intelligence

1.32%probability of exploitation in 30 days

67thpercentile

Moderate risk: more likely to be exploited than 67% of all known CVEs.

References

Exploit3

Third-Party Advisory1

access.redhat.com

Other references1

lists.debian.org

Related Vulnerabilities

Other CWE-863 (Incorrect Authorization) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-22518	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2023-38035	Critical	9.8	100%	KEV + Ransom	-
CVE-2022-46169	Critical	9.8	100%	KEV	Fix
CVE-2025-29927	Critical	9.1	100%	-	Fix
CVE-2024-38856	Critical	9.8	99%	KEV	Fix
CVE-2020-36289	Medium	5.3	99%	-	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.