Is CVE-2022-21659 in the CISA KEV catalog?

No. CVE-2022-21659 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2022-21659?

CVE-2022-21659 has a CVSS v3 base score of 5.3 (MEDIUM).

What is the EPSS score for CVE-2022-21659?

CVE-2022-21659 has an EPSS score of 0.95% (57th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2022-21659?

Upgrade flask-appbuilder to 3.4.2 or later.

CVE & CISA-KEV Catalog

CVE-2022-21659

MEDIUM

5.3

CVSS v3

NVD

Description

Flask-AppBuilder is an application development framework, built on top of the Flask web framework. In affected versions there exists a user enumeration vulnerability. This vulnerability allows for a non authenticated user to enumerate existing accounts by timing the response time from the server when you are logging in. Users are advised to upgrade to version 3.4.4 as soon as possible. There are no known workarounds for this issue.

CWE-203

How to fix

Remediation Available

flask-appbuilderNVD

Affected:< 3.4.2Fixed in:3.4.2CVE-2022-21659derived from NVD

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

ConfidentialityLow

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

0.95%probability of exploitation in 30 days

57thpercentile

Moderate risk: more likely to be exploited than 57% of all known CVEs.

References

Patch1

github.com

Third-Party Advisory1

github.com

Related Vulnerabilities

Other CWE-203 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2017-5753	Medium	5.6	94%	-	Fix
CVE-2003-0190	Medium	5.0	77%	-	Fix
CVE-2017-5715	Medium	5.6	74%	-	Fix
CVE-2018-3639	Medium	5.5	61%	-	Fix
CVE-2023-28770	High	7.5	58%	-	Fix
CVE-2004-1602	Medium	5.0	31%	-	-

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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 2025-05-05.