How severe is CVE-2021-28875?

CVE-2021-28875 has a CVSS 3.x base score of 7.5, rated high 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 high.

Is CVE-2021-28875 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (80th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-28875?

CVE-2021-28875 affects Rust-lang Rust. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-28875?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-28875 published?

CVE-2021-28875 was published on 2021-04-11 and last updated on 2026-06-17.

CVE-2021-28875

CVE-2021-28875 is a high-severity vulnerability in Rust-lang Rust with a CVSS 3.x base score of 7.5. 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-252.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 2% (80th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-252
Affected product: Rust-lang Rust
Published: 2021-04-11
Last modified: 2026-06-17

Description

In the standard library in Rust before 1.50.0, read_to_end() does not validate the return value from Read in an unsafe context. This bug could lead to a buffer overflow.

Frequently asked questions

What is CVE-2021-28875?: In the standard library in Rust before 1.50.0, read_to_end() does not validate the return value from Read in an unsafe context. This bug could lead to a buffer overflow.
How severe is CVE-2021-28875?: CVE-2021-28875 has a CVSS 3.x base score of 7.5, rated high 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 high.
Is CVE-2021-28875 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (80th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-28875?: CVE-2021-28875 affects Rust-lang Rust. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-28875?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-28875 published?: CVE-2021-28875 was published on 2021-04-11 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:rust-lang:rust:*:*:*:*:*:*:*:*

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