CVE-2020-35914: An issue was discovered in the lock_api crate before 0.4.2 for Rust

Q: How do I fix CVE-2020-35914?

lock api: upgrade to 0.4.2. Exact commands for each OS are on this page.

Q: Is CVE-2020-35914 being exploited?

CVE-2020-35914 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-2020-35914 affect?

CVE-2020-35914 affects lock api. Severity is medium (CVSS 4.7). An issue was discovered in the lock_api crate before 0.4.2 for Rust. A data race can occur because of RwLockWriteGuard unsoundness.

Q: How urgent is CVE-2020-35914?

Priority 19/100. No elevated risk signals yet.

Routine

MEDIUM 4.7UPGRADE

CVE-2020-35914 is a medium-severity flaw (CVSS 4.7) affecting lock api. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in the lock_api crate before 0.4.2 for Rust. A data race can occur because of RwLockWriteGuard unsoundness.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.7 (Medium)
Attack vector	Local
Attack complexity	High
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 89%)
CISA exploited list	No
Weakness	CWE-362
Published	2020-12-31
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: lock api 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

lock api project lock api UPGRADE

Affected: < 0.4.2

Fixed in: 0.4.2

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy lock-api || rpm -q lock-api || lock-api --version

2. UPGRADE to 0.4.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade lock-api

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade lock-api

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-2020-35914?

lock api: upgrade to 0.4.2. Exact commands for each OS are on this page.

Is CVE-2020-35914 being exploited?

CVE-2020-35914 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-2020-35914 affect?

CVE-2020-35914 affects lock api. Severity is medium (CVSS 4.7). An issue was discovered in the lock_api crate before 0.4.2 for Rust. A data race can occur because of RwLockWriteGuard unsoundness.

How urgent is CVE-2020-35914?

Priority 19/100. No elevated risk signals yet.

Related CVEs

CVE-2020-35913 MEDIUM 4.7 UPGRADE An issue was discovered in the lock_api crate before 0.4.2 for Rust
CVE-2020-35912 MEDIUM 4.7 UPGRADE An issue was discovered in the lock_api crate before 0.4.2 for Rust
CVE-2020-35911 MEDIUM 4.7 UPGRADE An issue was discovered in the lock_api crate before 0.4.2 for Rust
CVE-2020-35910 MEDIUM 5.5 UPGRADE An issue was discovered in the lock_api crate before 0.4.2 for Rust

References

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