What’s Vulnerable › Vulnerabilities

CVE-2021-42357: DOM based XSS Vulnerability in Apache Knox

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-01-17 · updated 2026-06-17
• Weakness: CWE-79

Description

When using Apache Knox SSO prior to 1.6.1, a request could be crafted to redirect a user to a malicious page due to improper URL parsing. A request that included a specially crafted request parameter could be used to redirect the user to a page controlled by an attacker. This URL would need to be presented to the user outside the normal request flow through a XSS or phishing campaign.

Affected products

• Apache Software Foundation Apache Knox: before 1.6.1 — fixed in 1.6.1

How to fix

Upgrade to a fixed version: Apache Software Foundation Apache Knox 1.6.1. Check the vendor advisory for mitigations.

References

• http://www.openwall.com/lists/oss-security/2022/01/17/2
• https://lists.apache.org/thread/b7v5dkpyqb51nw0lvz4cybhgrfhk1g7j
• http://www.openwall.com/lists/oss-security/2022/01/17/2
• https://lists.apache.org/thread/b7v5dkpyqb51nw0lvz4cybhgrfhk1g7j

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