CVE-2020-35862: An issue was discovered in the bitvec crate before 0.17.4 for Rust

Q: How do I fix CVE-2020-35862?

bitvec: upgrade to 0.17.4. Exact commands for each OS are on this page.

Q: Is CVE-2020-35862 being exploited?

CVE-2020-35862 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-2020-35862 affect?

CVE-2020-35862 affects bitvec. Severity is critical (CVSS 9.8). An issue was discovered in the bitvec crate before 0.17.4 for Rust. BitVec to BitBox conversion leads to a use-after-free or double free.

Q: How urgent is CVE-2020-35862?

Priority 63/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2020-35862 is a critical-severity flaw (CVSS 9.8) affecting bitvec. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in the bitvec crate before 0.17.4 for Rust. BitVec to BitBox conversion leads to a use-after-free or double free.

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.6% (top 24%)
CISA exploited list	No
Weakness	CWE-415, CWE-416
Published	2020-12-31
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: bitvec 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

bitvec project bitvec UPGRADE

Affected: < 0.17.4

Fixed in: 0.17.4

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 0.17.4 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade bitvec

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-2020-35862?

bitvec: upgrade to 0.17.4. Exact commands for each OS are on this page.

Is CVE-2020-35862 being exploited?

CVE-2020-35862 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-2020-35862 affect?

CVE-2020-35862 affects bitvec. Severity is critical (CVSS 9.8). An issue was discovered in the bitvec crate before 0.17.4 for Rust. BitVec to BitBox conversion leads to a use-after-free or double free.

How urgent is CVE-2020-35862?

Priority 63/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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