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CVE-2021-21238

6.5 · MEDIUM

PySAML2 is a pure python implementation of SAML Version 2 Standard.

Published Jan 21, 2021CWE-347EPSS 1.10%

Overview

CVE-2021-21238 is a medium-severity vulnerability. It was published on January 21, 2021 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

PySAML2 is a pure python implementation of SAML Version 2 Standard. PySAML2 before 6.5.0 has an improper verification of cryptographic signature vulnerability. All users of pysaml2 that need to validate signed SAML documents are impacted. The vulnerability is a variant of XML Signature wrapping because it did not validate the SAML document against an XML schema. This allowed invalid XML documents to be processed and such a document can trick pysaml2 with a wrapped signature. This is fixed in PySAML2 6.5.0.

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

GitHubgithub.com/IdentityPython/pysaml2/commit/1d8fd268f5bf887480a403a7a5ef8f048157cc14GitHubgithub.com/IdentityPython/pysaml2/releases/tag/v6.5.0GitHubgithub.com/IdentityPython/pysaml2/security/advisories/GHSA-f4g9-h89h-jgv9Refpypi.org/project/pysaml2GitHubgithub.com/IdentityPython/pysaml2/commit/1d8fd268f5bf887480a403a7a5ef8f048157cc14GitHubgithub.com/IdentityPython/pysaml2/releases/tag/v6.5.0GitHubgithub.com/IdentityPython/pysaml2/security/advisories/GHSA-f4g9-h89h-jgv9Refpypi.org/project/pysaml2

How CyberStrike helps

Frequently asked questions

What is CVE-2021-21238?

CVE-2021-21238 is a medium-severity vulnerability. It was published on January 21, 2021 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2021-21238?

This vulnerability has a CVSS 3.1 base score of 6.5, 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-2021-21238?

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-2021-21238?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-21238 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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