{"cve":"CVE-2021-24031","nvd":{"published":"2021-03-04T21:15:12.743","modified":"2026-06-17T03:39:11.537","status":"Modified","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","score":5.5},"cwes":["CWE-276","CWE-277"],"references":["https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=981404","https://github.com/facebook/zstd/issues/1630","https://www.facebook.com/security/advisories/cve-2021-24031","https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=981404","https://github.com/facebook/zstd/issues/1630"],"products":["facebook:zstandard"],"source":"nvd","synced_at":"2026-10-19T21:15:50.279857260+00:00"},"epss":{"cve":"CVE-2021-24031","score":0.00465,"percentile":0.40315,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}