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HIGH

CVE-2021-41072

CVSS v3

8.1

HIGH

EPSS Score

2.3 %

exploit probability, as of 2026-10-19

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • squashfs-toolsAlmaLinux:9all versions · fixed in 4.4-10.git1.el9
  • squashfs-toolsAlmaLinux:8all versions · fixed in 4.3-21.el8

Vendor advisories

  • CVE-2021-41072 Red Hat Product Security26 products fixed · 2 known affected

    squashfs-tools: possible Directory Traversal via symbolic link

    squashfs-tools as a component of Red Hat Enterprise Linux 6 · squashfs-tools as a component of Red Hat Enterprise Linux 7

  • RHSA-2024:3139 Red Hat Product Security13 products fixed

    Red Hat Security Advisory: squashfs-tools security update

  • RHSA-2024:2396 Red Hat Product Security13 products fixed

    Red Hat Security Advisory: squashfs-tools security update

Full record on NVD

Description

squashfs_opendir in unsquash-2.c in Squashfs-Tools 4.5 allows Directory Traversal, a different vulnerability than CVE-2021-40153. A squashfs filesystem that has been crafted to include a symbolic link and then contents under the same filename in a filesystem can cause unsquashfs to first create the symbolic link pointing outside the expected directory, and then the subsequent write operation will cause the unsquashfs process to write through the symbolic link elsewhere in the filesystem.

Technical details

Published
2021-09-14

Frequently asked questions

What is CVE-2021-41072?

squashfs_opendir in unsquash-2.c in Squashfs-Tools 4.5 allows Directory Traversal, a different vulnerability than CVE-2021-40153. A squashfs filesystem that has been crafted to include a symbolic link and then contents under the same filename in a filesystem can cause unsquashfs to first create the symbolic link pointing outside the expected directory, and then the subsequent write operation will cause the unsquashfs process to write through the symbolic link elsewhere in the filesystem.

Is CVE-2021-41072 actively exploited?

Active exploitation of CVE-2021-41072 has not been confirmed. Its EPSS score was 2.3% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-41072?

CVE-2021-41072 has a CVSS v3 base score of 8.1 (HIGH severity).

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