Reference page — cumulative record through Monday, October 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2021-24032

CVE-2021-24032MEDIUM

Facebook Zstandard — Beginning in v1.4.1 and prior to v1.4.9, due to an incomplete fix for CVE-2021-24031, the Zstandard command-line utility created output f…

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   L   H   L   N  U  H  N  N    4.7   .0035   26.9     —

AFFECTED
  Product    Versions  Fixed
  Zstandard  1.4.1 –   1.4.9

TIMELINE
  Jan 13  Reserved by facebook
  Mar 4   Published (CNA: facebook)
  Oct 8   ENRICHED — CVE-2021-24032 (Facebook Zstandard). Received CVSS 4.7 and CPE data from NVD.

CWE-276, CWE-277 · CNA: facebook · CVSS v3.1 · 3 references · NVD status: Modified

Description

Beginning in v1.4.1 and prior to v1.4.9, due to an incomplete fix for CVE-2021-24031, the Zstandard command-line utility created output files with default permissions and restricted those permissions immediately afterwards. Output files could therefore momentarily be readable or writable to unintended parties.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
January 13, 2021	Reserved	Reserved by facebook
March 4, 2021	Published	Published (CNA: facebook)
October 8, 2026	ENRICHED	ENRICHED — CVE-2021-24032 (Facebook Zstandard). Received CVSS 4.7 and CPE data from NVD.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Facebook	Zstandard	—	1.4.1	1.4.9

Weaknesses

CWE-276 · CWE-277

References (3)

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=982519 [Patch, Third Party Advisory]
https://github.com/facebook/zstd/issues/2491 [Issue Tracking, Patch, Third Party Advisory]
https://www.facebook.com/security/advisories/cve-2021-24032 [Third Party Advisory]

Authoritative record: CVE-2021-24032 at cve.org

Vendors: facebook

Weaknesses: CWE-276 · CWE-277

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2021-24032 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Monday, October 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.