CVE-2021-29942: An issue was discovered in the reorder crate through 2021-02-24 for Rust

Q: How do I fix CVE-2021-29942?

reorder: upgrade to newer than 2021-02-24. Exact commands for each OS are on this page.

Q: Is CVE-2021-29942 being exploited?

CVE-2021-29942 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-29942 affect?

CVE-2021-29942 affects reorder. Severity is high (CVSS 7.3). An issue was discovered in the reorder crate through 2021-02-24 for Rust. swap_index can return uninitialized values if an iterator returns a len() that is too large.

Q: How urgent is CVE-2021-29942?

Priority 51/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 7.3REMOTEUPGRADE

CVE-2021-29942 is a high-severity flaw (CVSS 7.3) affecting reorder. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in the reorder crate through 2021-02-24 for Rust. swap_index can return uninitialized values if an iterator returns a len() that is too large.

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	7.3 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.9% (top 39%)
CISA exploited list	No
Weakness	CWE-787
Published	2021-04-01
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: reorder project

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

Am I affected?

Timeline

2021-04-01 05:15 UTCPublished CVE record published
2026-06-17 03:48 UTCUpdated Record last modified

reorder project reorder UPGRADE

Affected: <= 2021-02-24

Fixed in: newer than 2021-02-24

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 2021-02-24 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade reorder

Note

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

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-2021-29942?

reorder: upgrade to newer than 2021-02-24. Exact commands for each OS are on this page.

Is CVE-2021-29942 being exploited?

CVE-2021-29942 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-2021-29942 affect?

CVE-2021-29942 affects reorder. Severity is high (CVSS 7.3). An issue was discovered in the reorder crate through 2021-02-24 for Rust. swap_index can return uninitialized values if an iterator returns a len() that is too large.

How urgent is CVE-2021-29942?

Priority 51/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2021-29941 HIGH 7.3 UPGRADE An issue was discovered in the reorder crate through 2021-02-24 for Rust

References

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