CVE-2021-45683: An issue was discovered in the binjs_io crate through 2021-01-03 for Rust

This month

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2021-45683 is a critical-severity flaw (CVSS 9.8) affecting binjs io. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in the binjs_io crate through 2021-01-03 for Rust. The Read method may read from uninitialized memory locations.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.2% (top 31%)
CISA exploited list	No
Weakness	CWE-908
Published	2021-12-27
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: binjs io project

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

Am I affected?

Timeline

2021-12-27 00:15 UTCPublished CVE record published
2026-06-17 04:13 UTCUpdated Record last modified

binjs io project binjs io DOWNGRADE

Affected: 0.2.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.2.1

1. Check installed version

apt-cache policy binjs-io || rpm -q binjs-io || binjs-io --version

2. No fixed release: DOWNGRADE to a release before 0.2.1 (Debian / Ubuntu)

apt-cache madison binjs-io sudo apt install binjs-io=<VERSION_BEFORE_0.2.1> sudo apt-mark hold binjs-io

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

dnf --showduplicates list binjs-io sudo dnf downgrade binjs-io-<VERSION_BEFORE_0.2.1> sudo dnf versionlock add binjs-io

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-2021-45683?

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

Is CVE-2021-45683 being exploited?

CVE-2021-45683 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-2021-45683 affect?

CVE-2021-45683 affects binjs io. Severity is critical (CVSS 9.8). An issue was discovered in the binjs_io crate through 2021-01-03 for Rust. The Read method may read from uninitialized memory locations.

How urgent is CVE-2021-45683?

Priority 57/100. Critical severity; Remotely exploitable, no login, no user action

References

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