CVE-2020-35882: An issue was discovered in the rocket crate before 0.4.5 for Rust

This week

HIGH 8.1REMOTEUPGRADE

CVE-2020-35882 is a high-severity flaw (CVSS 8.1) affecting rocket. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in the rocket crate before 0.4.5 for Rust. LocalRequest::clone creates more than one mutable references to the same object, possibly causing a data race.

Why this priority

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

A fixed release or distro patch exists.

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	1.0% (top 38%)
CISA exploited list	No
Weakness	CWE-362
Published	2020-12-31
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: rocket

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

Am I affected?

Timeline

2020-12-31 10:15 UTCPublished CVE record published
2026-06-17 03:14 UTCUpdated Record last modified

rocket rocket UPGRADE

Affected: >= 0.4.0 and < 0.4.5

Fixed in: 0.4.5

Safe to downgrade to: a release before 0.4.0

1. Check installed version

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

2. UPGRADE to 0.4.5 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade rocket

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade rocket

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 0.4.0 (Debian / Ubuntu)

apt-cache madison rocket sudo apt install rocket=<VERSION_BEFORE_0.4.0> sudo apt-mark hold rocket

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list rocket sudo dnf downgrade rocket-<VERSION_BEFORE_0.4.0> sudo dnf versionlock add rocket

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-2020-35882?

rocket: upgrade to 0.4.5. Exact commands for each OS are on this page.

Is CVE-2020-35882 being exploited?

CVE-2020-35882 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-2020-35882 affect?

CVE-2020-35882 affects rocket. Severity is high (CVSS 8.1). An issue was discovered in the rocket crate before 0.4.5 for Rust. LocalRequest::clone creates more than one mutable references to the same object, possibly causing a data race.

How urgent is CVE-2020-35882?

Priority 54/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2021-29935 HIGH 7.3 UPGRADE An issue was discovered in the rocket crate before 0.4.7 for Rust

References

← Back to latest CVEs