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CVE-2021-30855

5.5 · MEDIUM

A validation issue existed in the handling of symlinks.

Published Aug 24, 2021CWE-59EPSS 2.40%

Overview

CVE-2021-30855 is a medium-severity vulnerability. It was published on August 24, 2021 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical description

A validation issue existed in the handling of symlinks. This issue was addressed with improved validation of symlinks. This issue is fixed in Security Update 2021-005 Catalina, iOS 14.8 and iPadOS 14.8, iOS 15 and iPadOS 15, watchOS 8, macOS Big Sur 11.6. An application may be able to access restricted files.

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

Refsupport.apple.com/en-us/HT212804Refsupport.apple.com/en-us/HT212805Refsupport.apple.com/en-us/HT212807Refsupport.apple.com/en-us/HT212814Refsupport.apple.com/en-us/HT212819Refsupport.apple.com/kb/HT212815Refsupport.apple.com/en-us/HT212804Refsupport.apple.com/en-us/HT212805Refsupport.apple.com/en-us/HT212807Refsupport.apple.com/en-us/HT212814

How CyberStrike helps

Frequently asked questions

What is CVE-2021-30855?

CVE-2021-30855 is a medium-severity vulnerability. It was published on August 24, 2021 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2021-30855?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-30855?

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-2021-30855?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-30855 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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