CVE-2021-24031

MEDIUM

Facebook Zstandard < 1.4.1 - Incorrect Default Permissions

Title source: rule

Description

In the Zstandard command-line utility prior to v1.4.1, output files were created with default permissions. Correct file permissions (matching the input) would only be set at completion time. Output files could therefore be readable or writable to unintended parties.

References (3)

[Exploit, Issue Tracking, Third Party Advisory] https://github.com/facebook/zstd/issues/1630

[Exploit, Issue Tracking, Mailing List, Third Party Advisory] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=981404

[Vendor Advisory] https://www.facebook.com/security/advisories/cve-2021-24031

Scores

CVSS v3 5.5

EPSS 0.0007

EPSS Percentile 22.1%

Attack Vector LOCAL

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Details

CWE

CWE-277 CWE-276

Status published

Products (1)

facebook/zstandard < 1.4.1

Published Mar 04, 2021

Tracked Since Feb 18, 2026