CVE-2021-3563: debian debian_linux Incorrect Authorization
Vulnerability summary
CVE-2021-3563 is a high (CVSS 7.4) Incorrect Authorization vulnerability in debian debian_linux. EPSS estimates a 1.86% chance of exploitation in the next 30 days, higher than 79.2% of scored vulnerabilities. 3 public exploits are recorded.
Public exploit (reference, Date unknown)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 2 · Related 1Timeline
- 26-08-2022PublishedVulnerability first disclosed.
- 13-02-2025Last modifiedVulnerability information updated.
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.
CVSS metrics
4 scores · 4 sources · 1 version- OSV · PypiEcosystem advisory · calculated9.1CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:NDiffers
- OSV · UbuntuEcosystem advisory · calculated7.4HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
- OSV · DebianEcosystem advisory · calculated7.4HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
EPSS trend
Probability
1.86%
Chance of exploitation in the next 30 days
Percentile
79%
Versus all other CVEs
30-day change
Increase +0.12 pp
From 1.75% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
3 foundExploit Reference (bugs.launchpad.net)
Maturity: unknown
Exploit Reference (bugzilla.redhat.com)
Maturity: unknown
Exploit Reference (security-tracker.debian.org)
Maturity: unknown
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Debian2 products
- keystoneAll versions (No fix recorded) | < 2:23.0.0-3
- debian_linuxEOL10.0 | 11.0
PyPI1 product
- keystone≤ 21.0.0
Redhat1 product
- openstack_platform10.0 | 13.0 | 16.1 | 16.2
Ubuntu1 product
- keystoneAll versions (No fix recorded) | < 2:21.0.1-0ubuntu2.1
4 vendors · 5 products
References
17 links- bugs.launchpad.net/ossa/+bug/1901891X Refsource MISCWEBExploitIssue TrackingThird Party AdvisoryVDB Entry
- bugzilla.redhat.com/show_bug.cgi?id=1962908X Refsource MISCWEBExploitIssue TrackingThird Party AdvisoryVendor Advisory
security-tracker.debian.org/tracker/CVE-2021-3563X Refsource MISCWEBAdvisoryExploitIssue TrackingThird Party Advisory