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CVE-2022-21659

20
FAUCET Score

CVE-2022-21659 is a user enumeration vulnerability in Flask-AppBuilder, an application development framework. An unauthenticated attacker can identify valid user accounts by observing server response times during login attempts. With a CVSS score of 5.3 (Medium), this low-complexity vulnerability allows for partial confidentiality impact without requiring user interaction. There is no evidence of active exploitation, public exploit code, or significant community discussion, and it is not listed in CISA's KEV catalog.

Impacted Technologies

VendorProductVersion(s)CPE
< 3.4.2CPE matchmatch criteria
cpe:2.3:a:dpgaspar:flask-appbuilder:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.3MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.95%
Probability of exploitation in next 30 days
EPSS Percentile
57.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0095 is in the 36th percentile among its peer group of 23,705 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
pippatch availablevia ghsa
Product: Flask-AppBuilderFixed in: 3.4.4

Vendor Advisories (1)

pipGHSA-wfjw-w6pv-8p7fmedium

Observable Response Discrepancy in Flask-AppBuilder

Feb 1, 2022

References

github.com / dpgaspar/Flask-AppBuilder/pull/1775
PatchThird Party Advisory
github.com / dpgaspar/Flask-AppBuilder/security/advisories/GHSA-wfjw-w6pv-8p7f
Third Party Advisory