CVE-2021-20733

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-06-22 · updated 2026-06-17
Weakness: CWE-862

Description

Improper authorization in handler for custom URL scheme vulnerability in あすけんダイエット (asken diet) for Android versions from v.3.0.0 to v.4.2.x allows a remote attacker to lead a user to access an arbitrary website via the vulnerable App.

Affected products

asken Inc. あすけんダイエット (asken diet) for Android: from 3.0.0 before 4.3.0 — fixed in 4.3.0

How to fix

Upgrade to a fixed version: asken Inc. あすけんダイエット (asken diet) for Android 4.3.0. Check the vendor advisory for mitigations.

References

https://jvn.jp/en/jp/JVN38034268/index.html
https://www.asken.jp/s/login/?to=/information
https://jvn.jp/en/jp/JVN38034268/index.html
https://www.asken.jp/s/login/?to=/information

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