CVE-2020-36323

Name: CVE-2020-36323
Creator: NVD / NIST
Published: 2021-04-14T07:15:12.087+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.2/10EPSS 2.02%

Last modified Jun 17, 2026

CVE-2020-36323 is a high-severity vulnerability rated 8.2/10 on the CVSS scale. In the standard library in Rust before 1.52.0, there is an optimization for joining strings that can cause uninitialized bytes to be exposed (or the program to crash) if the borrowed string changes after its length is checked.. EPSS estimates a 2.02% chance of exploitation in the next 30 days.

Description

In the standard library in Rust before 1.52.0, there is an optimization for joining strings that can cause uninitialized bytes to be exposed (or the program to crash) if the borrowed string changes after its length is checked.

Metrics

CVSS 3.1

8.2/10

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

EPSS Probability

2.02%

78.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-134

Affected Software

Vendor	Product	Versions
Rust-Lang	Rust	< 1.52.0
Fedoraproject	Fedora	32
Fedoraproject	Fedora	33
Fedoraproject	Fedora	34

References

https://github.com/rust-lang/rust/issues/80335Patch, Third Party Advisory
https://github.com/rust-lang/rust/pull/81728Patch, Third Party Advisory
https://github.com/rust-lang/rust/pull/81728#issuecomment-821549174Patch, Third Party Advisory
https://github.com/rust-lang/rust/pull/81728#issuecomment-824904190Patch, 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://github.com/rust-lang/rust/issues/80335Patch, Third Party Advisory
https://github.com/rust-lang/rust/pull/81728Patch, Third Party Advisory
https://github.com/rust-lang/rust/pull/81728#issuecomment-821549174Patch, Third Party Advisory
https://github.com/rust-lang/rust/pull/81728#issuecomment-824904190Patch, 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/

Timeline

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

Frequently Asked Questions

What is CVE-2020-36323?

How severe is CVE-2020-36323?

CVE-2020-36323 has a CVSS score of 8.2/10 (HIGH severity). The EPSS model estimates a 2.02% probability of exploitation in the next 30 days.

How do I fix CVE-2020-36323?

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-2020-36323?

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

Scan your code now

Source: NVD / NIST