How severe is CVE-2021-25901?

CVE-2021-25901 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.

Is CVE-2021-25901 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (67th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-25901?

CVE-2021-25901 affects Lazy-init Project Lazy-init. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-25901?

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

When was CVE-2021-25901 published?

CVE-2021-25901 was published on 2021-01-26 and last updated on 2026-06-17.

CVE-2021-25901

CVE-2021-25901 is a medium-severity vulnerability in Lazy-init Project Lazy-init with a CVSS 3.x base score of 5.3. 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-125.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v2: 5.0
EPSS exploit prediction: 1% (67th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-125
Affected product: Lazy-init Project Lazy-init
Published: 2021-01-26
Last modified: 2026-06-17

Description

An issue was discovered in the lazy-init crate through 2021-01-17 for Rust. Lazy lacks a Send bound, leading to a data race.

Frequently asked questions

What is CVE-2021-25901?: An issue was discovered in the lazy-init crate through 2021-01-17 for Rust. Lazy lacks a Send bound, leading to a data race.
How severe is CVE-2021-25901?: CVE-2021-25901 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.
Is CVE-2021-25901 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (67th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-25901?: CVE-2021-25901 affects Lazy-init Project Lazy-init. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-25901?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-25901 published?: CVE-2021-25901 was published on 2021-01-26 and last updated on 2026-06-17.

References

https://rustsec.org/advisories/RUSTSEC-2021-0004.html

Affected products (1)

cpe:2.3:a:lazy-init_project:lazy-init:*:*:*:*:*:rust:*:*

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