CVE-2021-28877

Name: CVE-2021-28877
Creator: NVD / NIST
Published: 2021-04-11T20:15:12.737+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.39%

Last modified Jun 17, 2026

CVE-2021-28877 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. In the standard library in Rust before 1.51.0, the Zip implementation calls __iterator_get_unchecked() for the same index more than once when nested. This bug can lead to a memory safety violation due to an unmet safety requirement for the TrustedRandomAccess trait.. EPSS estimates a 1.39% chance of exploitation in the next 30 days.

Description

In the standard library in Rust before 1.51.0, the Zip implementation calls __iterator_get_unchecked() for the same index more than once when nested. This bug can lead to a memory safety violation due to an unmet safety requirement for the TrustedRandomAccess trait.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

1.39%

68.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-119

Affected Software

Vendor	Product	Versions
Rust-Lang	Rust	< 1.51.0

References

https://github.com/rust-lang/rust/pull/80670Issue Tracking, Patch, Third Party Advisory
https://security.gentoo.org/glsa/202210-09Third Party Advisory
https://github.com/rust-lang/rust/pull/80670Issue Tracking, Patch, Third Party Advisory
https://security.gentoo.org/glsa/202210-09Third Party Advisory

Timeline

Published: Apr 11, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-28877?

How severe is CVE-2021-28877?

CVE-2021-28877 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.39% probability of exploitation in the next 30 days.

How do I fix CVE-2021-28877?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-28877?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST