CVE-2021-31162

Name: CVE-2021-31162
Creator: NVD / NIST
Published: 2021-04-14T07:15:12.227+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 2.89%

Last modified Jun 17, 2026

CVE-2021-31162 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. In the standard library in Rust before 1.52.0, a double free can occur in the Vec::from_iter function if freeing the element panics.. EPSS estimates a 2.89% chance of exploitation in the next 30 days.

Description

In the standard library in Rust before 1.52.0, a double free can occur in the Vec::from_iter function if freeing the element panics.

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

2.89%

85.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-415

Affected Software

Vendor	Product	Versions
Rust-Lang	Rust	>= 1.48.0, < 1.52.0
Fedoraproject	Fedora	32
Fedoraproject	Fedora	33
Fedoraproject	Fedora	34

References

https://github.com/rust-lang/rust/issues/83618Exploit, Third Party Advisory
https://github.com/rust-lang/rust/pull/83629Patch, Third Party Advisory
https://github.com/rust-lang/rust/pull/84603Patch, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CZ337CM4GFJLRDFVQCGC7J25V65JXOG5/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TFUO3URYCO73D2Q4WYJBWAMJWGGVXQO4/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VZG65GUW6Z2CYOQHF7T3TB5CZKIX6ZJE/
https://security.gentoo.org/glsa/202210-09Third Party Advisory
https://github.com/rust-lang/rust/issues/83618Exploit, Third Party Advisory
https://github.com/rust-lang/rust/pull/83629Patch, Third Party Advisory
https://github.com/rust-lang/rust/pull/84603Patch, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CZ337CM4GFJLRDFVQCGC7J25V65JXOG5/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TFUO3URYCO73D2Q4WYJBWAMJWGGVXQO4/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VZG65GUW6Z2CYOQHF7T3TB5CZKIX6ZJE/
https://security.gentoo.org/glsa/202210-09Third Party Advisory

Timeline

Published: Apr 14, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-31162?

In the standard library in Rust before 1.52.0, a double free can occur in the Vec::from_iter function if freeing the element panics.

How severe is CVE-2021-31162?

CVE-2021-31162 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 2.89% probability of exploitation in the next 30 days.

How do I fix CVE-2021-31162?

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-2021-31162?

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

Scan your code now

Source: NVD / NIST