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CVE-2021-20873

8.1 · HIGH

Yappli is an application development platform which provides the function to access a requested URL using Custom URL Scheme.

Published Dec 28, 2021CWE-862EPSS 0.87%

Overview

CVE-2021-20873 is a high-severity vulnerability. It was published on December 28, 2021 and has a CVSS 3.1 base score of 8.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Yappli is an application development platform which provides the function to access a requested URL using Custom URL Scheme. When Android apps are developed with Yappli versions since v7.3.6 and prior to v9.30.0, they are vulnerable to improper authorization in Custom URL Scheme handler, and may be directed to unintended sites via a specially crafted URL.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refjvn.jp/en/jp/JVN66422035/index.htmlRefsupport.yappli.co.jp/hc/ja/articles/4410249902745Refjvn.jp/en/jp/JVN66422035/index.htmlRefsupport.yappli.co.jp/hc/ja/articles/4410249902745

How CyberStrike helps

Frequently asked questions

What is CVE-2021-20873?

CVE-2021-20873 is a high-severity vulnerability. It was published on December 28, 2021 and has a CVSS 3.1 base score of 8.1 (HIGH).

How severe is CVE-2021-20873?

This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-20873?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-20873?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-20873 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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