CVE-2021-42357

Name: CVE-2021-42357
Creator: NVD / NIST
Published: 2022-01-17T20:15:07.697+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 2.58%

Last modified Jun 17, 2026

CVE-2021-42357 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. 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. EPSS estimates a 2.58% chance of exploitation in the next 30 days.

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.

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

2.58%

83.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Apache	Knox	< 1.6.1

References

http://www.openwall.com/lists/oss-security/2022/01/17/2Mailing List, Third Party Advisory
https://lists.apache.org/thread/b7v5dkpyqb51nw0lvz4cybhgrfhk1g7jMailing List, Vendor Advisory
http://www.openwall.com/lists/oss-security/2022/01/17/2Mailing List, Third Party Advisory
https://lists.apache.org/thread/b7v5dkpyqb51nw0lvz4cybhgrfhk1g7jMailing List, Vendor Advisory

Timeline

Published: Jan 17, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-42357?

How severe is CVE-2021-42357?

CVE-2021-42357 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 2.58% probability of exploitation in the next 30 days.

How do I fix CVE-2021-42357?

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-2021-42357?

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

Scan your code now

Source: NVD / NIST