CVE-2021-20733

Name: CVE-2021-20733
Creator: NVD / NIST
Published: 2021-06-22T02:15:07.133+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 0.82%

Last modified Jun 17, 2026

CVE-2021-20733 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. 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.. EPSS estimates a 0.82% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

6.1/10

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

EPSS Probability

0.82%

52.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-862

Affected Software

Vendor	Product	Versions
Asken	Asken	>= 3.0.0, < 4.3.0

References

https://jvn.jp/en/jp/JVN38034268/index.htmlThird Party Advisory
https://www.asken.jp/s/login/?to=/informationPermissions Required, Vendor Advisory
https://jvn.jp/en/jp/JVN38034268/index.htmlThird Party Advisory
https://www.asken.jp/s/login/?to=/informationPermissions Required, Vendor Advisory

Timeline

Published: Jun 22, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-20733?

How severe is CVE-2021-20733?

CVE-2021-20733 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 0.82% probability of exploitation in the next 30 days.

How do I fix CVE-2021-20733?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-20733?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST