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CVE-2021-34807

6.1 · MEDIUM

An open redirect vulnerability exists in the /preauth Servlet in Zimbra Collaboration Suite through 9.0.

Published Jul 2, 2021CWE-601EPSS 0.98%

Overview

CVE-2021-34807 is a medium-severity vulnerability. It was published on July 2, 2021 and has a CVSS 3.1 base score of 6.1 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.1, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

An open redirect vulnerability exists in the /preauth Servlet in Zimbra Collaboration Suite through 9.0. To exploit the vulnerability, an attacker would need to have obtained a valid zimbra auth token or a valid preauth token. Once the token is obtained, an attacker could redirect a user to any URL via isredirect=1&redirectURL= in conjunction with the token data (e.g., a valid authtoken= value).

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

Refwiki.zimbra.com/wiki/Security_CenterRefwiki.zimbra.com/wiki/Zimbra_Releases/8.8.15/P23Refwiki.zimbra.com/wiki/Zimbra_Releases/9.0.0/P16Refwiki.zimbra.com/wiki/Zimbra_Security_AdvisoriesRefwiki.zimbra.com/wiki/Security_CenterRefwiki.zimbra.com/wiki/Zimbra_Releases/8.8.15/P23Refwiki.zimbra.com/wiki/Zimbra_Releases/9.0.0/P16Refwiki.zimbra.com/wiki/Zimbra_Security_Advisories

How CyberStrike helps

Frequently asked questions

What is CVE-2021-34807?

CVE-2021-34807 is a medium-severity vulnerability. It was published on July 2, 2021 and has a CVSS 3.1 base score of 6.1 (MEDIUM).

How severe is CVE-2021-34807?

This vulnerability has a CVSS 3.1 base score of 6.1, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-34807?

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-2021-34807?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-34807 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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