CVE-2021-40153
8.1 · HIGHOverview
CVE-2021-40153 is a high-severity vulnerability affecting squashfs-tools_project squashfs-tools. It was published on August 27, 2021 and has a CVSS 3.1 base score of 8.1 (HIGH).
This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical Description
squashfs_opendir in unsquash-1.c in Squashfs-Tools 4.5 stores the filename in the directory entry; this is then used by unsquashfs to create the new file during the unsquash. The filename is not validated for traversal outside of the destination directory, and thus allows writing to locations outside of the destination.
Remediation
Check the references section for vendor advisories and patches from squashfs-tools_project. Update squashfs-tools to the latest patched version. 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.
Affected Products
| Vendor | Product | Versions | Status |
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References
Frequently Asked Questions
What is CVE-2021-40153?
CVE-2021-40153 is a high-severity vulnerability affecting squashfs-tools_project squashfs-tools. It was published on August 27, 2021 and has a CVSS 3.1 base score of 8.1 (HIGH).
How severe is CVE-2021-40153?
This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2021-40153?
Check the references section for vendor advisories and patches from squashfs-tools_project. Update squashfs-tools to the latest patched version. 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-2021-40153?
CyberStrike's AI-powered security agents can automatically detect CVE-2021-40153 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
Automated penetration testing that runs continuously, not just quarterly.
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