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CVE-2021-42564

5.4 · MEDIUM

An open redirect through HTML injection in confidential messages in Cryptshare before 5.1.0 allows remote attackers (with permission to provide confidential messages via Cryptshare) to redirect tar…

Published Nov 30, 2021CWE-601EPSS 0.69%

Overview

CVE-2021-42564 is a medium-severity vulnerability. It was published on November 30, 2021 and has a CVSS 3.1 base score of 5.4 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.4, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

An open redirect through HTML injection in confidential messages in Cryptshare before 5.1.0 allows remote attackers (with permission to provide confidential messages via Cryptshare) to redirect targeted victims to any URL via the '<meta http-equiv="refresh"' substring in the editor parameter.

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

Refwww.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2021-057.txtRefwww.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2021-057.txt

How CyberStrike helps

Frequently asked questions

What is CVE-2021-42564?

CVE-2021-42564 is a medium-severity vulnerability. It was published on November 30, 2021 and has a CVSS 3.1 base score of 5.4 (MEDIUM).

How severe is CVE-2021-42564?

This vulnerability has a CVSS 3.1 base score of 5.4, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-42564?

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-2021-42564?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-42564 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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