CVE-2020-35923: An issue was discovered in the ordered-float crate before 1.1.1 and 2.x before 2.0.1 for Rust

Routine

MEDIUM 5.5UPGRADE

CVE-2020-35923 is a medium-severity flaw (CVSS 5.5) affecting ordered-float. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in the ordered-float crate before 1.1.1 and 2.x before 2.0.1 for Rust. A NotNan value can contain a NaN.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.4% (top 67%)
CISA exploited list	No
Weakness	CWE-416
Published	2020-12-31
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: ordered-float project

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 09:15 UTCPublished CVE record published
2026-06-17 03:14 UTCUpdated Record last modified

ordered-float project ordered-float UPGRADE

Affected: >= 0.2.2 and < 1.1.1 · >= 2.0.0 and < 2.0.1

Fixed in: 1.1.1, 2.0.1

Safe to downgrade to: a release before 0.2.2

1. Check installed version

apt-cache policy ordered-float || rpm -q ordered-float || ordered-float --version

2. UPGRADE to 1.1.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade ordered-float

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade ordered-float

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 0.2.2 (Debian / Ubuntu)

apt-cache madison ordered-float sudo apt install ordered-float=<VERSION_BEFORE_0.2.2> sudo apt-mark hold ordered-float

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

dnf --showduplicates list ordered-float sudo dnf downgrade ordered-float-<VERSION_BEFORE_0.2.2> sudo dnf versionlock add ordered-float

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-2020-35923?

ordered-float: upgrade to 1.1.1, 2.0.1. Exact commands for each OS are on this page.

Is CVE-2020-35923 being exploited?

CVE-2020-35923 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-2020-35923 affect?

CVE-2020-35923 affects ordered-float. Severity is medium (CVSS 5.5). An issue was discovered in the ordered-float crate before 1.1.1 and 2.x before 2.0.1 for Rust. A NotNan value can contain a NaN.

How urgent is CVE-2020-35923?

Priority 33/100. Public exploit reference

References

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