CVE-2020-35893: An issue was discovered in the simple-slab crate before 0.3.3 for Rust

Q: How do I fix CVE-2020-35893?

simple-slab: upgrade to 0.3.3. Exact commands for each OS are on this page.

Q: Is CVE-2020-35893 being exploited?

CVE-2020-35893 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-2020-35893 affect?

CVE-2020-35893 affects simple-slab. Severity is high (CVSS 7.5). An issue was discovered in the simple-slab crate before 0.3.3 for Rust. remove() has an off-by-one error, causing memory leakage and a drop of uninitialized memory.

Q: How urgent is CVE-2020-35893?

Priority 49/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 7.5REMOTEUPGRADE

CVE-2020-35893 is a high-severity flaw (CVSS 7.5) affecting simple-slab. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in the simple-slab crate before 0.3.3 for Rust. remove() has an off-by-one error, causing memory leakage and a drop of uninitialized memory.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.4% (top 28%)
CISA exploited list	No
Weakness	CWE-193, CWE-401, CWE-908
Published	2020-12-31
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: simple-slab 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 10:15 UTCPublished CVE record published
2026-06-17 03:14 UTCUpdated Record last modified

simple-slab project simple-slab UPGRADE

Affected: < 0.3.3

Fixed in: 0.3.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy simple-slab || rpm -q simple-slab || simple-slab --version

2. UPGRADE to 0.3.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade simple-slab

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade simple-slab

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-2020-35893?

simple-slab: upgrade to 0.3.3. Exact commands for each OS are on this page.

Is CVE-2020-35893 being exploited?

CVE-2020-35893 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-2020-35893 affect?

CVE-2020-35893 affects simple-slab. Severity is high (CVSS 7.5). An issue was discovered in the simple-slab crate before 0.3.3 for Rust. remove() has an off-by-one error, causing memory leakage and a drop of uninitialized memory.

How urgent is CVE-2020-35893?

Priority 49/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2020-35892 CRITICAL 9.1 UPGRADE An issue was discovered in the simple-slab crate before 0.3.3 for Rust

References

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