CVE-2020-36457: An issue was discovered in the lever crate before 0.1.1 for Rust

This week

HIGH 8.1REMOTEDOWNGRADE

CVE-2020-36457 is a high-severity flaw (CVSS 8.1) affecting lever. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in the lever crate before 0.1.1 for Rust. AtomicBox<T> implements the Send and Sync traits for all types T.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	1.2% (top 31%)
CISA exploited list	No
Weakness	CWE-77
Published	2021-08-08
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: lever project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-08-08 06:15 UTCPublished CVE record published
2026-06-17 03:15 UTCUpdated Record last modified

lever project lever DOWNGRADE

Affected: 0.0.0 · 0.1.0 · 0.1.1 alpha1 · 0.1.1 alpha11 · 0.1.1 alpha2 · 0.1.1 alpha3 · 0.1.1 alpha4 · 0.1.1 alpha5

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.0.0

1. Check installed version

apt-cache policy lever || rpm -q lever || lever --version

2. No fixed release: DOWNGRADE to a release before 0.0.0 (Debian / Ubuntu)

apt-cache madison lever sudo apt install lever=<VERSION_BEFORE_0.0.0> sudo apt-mark hold lever

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list lever sudo dnf downgrade lever-<VERSION_BEFORE_0.0.0> sudo dnf versionlock add lever

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2020-36457?

lever: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-36457 being exploited?

CVE-2020-36457 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2020-36457 affect?

CVE-2020-36457 affects lever. Severity is high (CVSS 8.1). An issue was discovered in the lever crate before 0.1.1 for Rust. AtomicBox<T> implements the Send and Sync traits for all types T.

How urgent is CVE-2020-36457?

Priority 56/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

References

← Back to latest CVEs