How severe is CVE-2021-24032?

CVE-2021-24032 has a CVSS 3.x base score of 4.7, rated medium severity. It is exploitable over local access with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2021-24032 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-24032?

CVE-2021-24032 affects Facebook Zstandard. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-24032?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-24032 published?

CVE-2021-24032 was published on 2021-03-04 and last updated on 2026-06-17.

CVE-2021-24032

CVE-2021-24032 is a medium-severity vulnerability in Facebook Zstandard with a CVSS 3.x base score of 4.7. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-276.

Key facts

Severity: Medium (CVSS 3.x base score 4.7)
CVSS v2: 1.9
EPSS exploit prediction: 0% (27th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-276
Affected product: Facebook Zstandard
Published: 2021-03-04
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2021-24032?: 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.
How severe is CVE-2021-24032?: CVE-2021-24032 has a CVSS 3.x base score of 4.7, rated medium severity. It is exploitable over local access with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2021-24032 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-24032?: CVE-2021-24032 affects Facebook Zstandard. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-24032?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-24032 published?: CVE-2021-24032 was published on 2021-03-04 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:facebook:zstandard:*:*:*:*:*:*:*:*

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