CVE-2021-28032

Name: CVE-2021-28032
Creator: NVD / NIST
Published: 2021-03-05T09:15:14.097+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.38%

Last modified Jun 17, 2026

CVE-2021-28032 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. An issue was discovered in the nano_arena crate before 0.5.2 for Rust. There is an aliasing violation in split_at because two mutable references can exist for the same element, if Borrow<Idx> behaves in certain ways. EPSS estimates a 1.38% chance of exploitation in the next 30 days.

Description

An issue was discovered in the nano_arena crate before 0.5.2 for Rust. There is an aliasing violation in split_at because two mutable references can exist for the same element, if Borrow<Idx> behaves in certain ways. This can have a resultant out-of-bounds write or use-after-free.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

1.38%

68.6th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Nano Arena Project	Nano Arena	< 0.5.2

References

https://rustsec.org/advisories/RUSTSEC-2021-0031.htmlExploit, Patch, Third Party Advisory
https://rustsec.org/advisories/RUSTSEC-2021-0031.htmlExploit, Patch, Third Party Advisory

Timeline

Published: Mar 5, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-28032?

How severe is CVE-2021-28032?

CVE-2021-28032 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.38% probability of exploitation in the next 30 days.

How do I fix CVE-2021-28032?

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-2021-28032?

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

Scan your code now

Source: NVD / NIST