CVE-2021-45686: An issue was discovered in the csv-sniffer crate through 2021-01-05 for Rust

This month

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2021-45686 is a critical-severity flaw (CVSS 9.8) affecting csv-sniffer. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in the csv-sniffer crate through 2021-01-05 for Rust. preamble_skipcount may read from uninitialized memory locations.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.2% (top 31%)
CISA exploited list	No
Weakness	CWE-908
Published	2021-12-27
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: csv-sniffer project

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

Am I affected?

Timeline

2021-12-27 00:15 UTCPublished CVE record published
2026-06-17 04:13 UTCUpdated Record last modified

csv-sniffer project csv-sniffer DOWNGRADE

Affected: 0.0.1 · 0.1.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.0.1

1. Check installed version

apt-cache policy csv-sniffer || rpm -q csv-sniffer || csv-sniffer --version

2. No fixed release: DOWNGRADE to a release before 0.0.1 (Debian / Ubuntu)

apt-cache madison csv-sniffer sudo apt install csv-sniffer=<VERSION_BEFORE_0.0.1> sudo apt-mark hold csv-sniffer

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list csv-sniffer sudo dnf downgrade csv-sniffer-<VERSION_BEFORE_0.0.1> sudo dnf versionlock add csv-sniffer

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-2021-45686?

csv-sniffer: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-45686 being exploited?

CVE-2021-45686 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-2021-45686 affect?

CVE-2021-45686 affects csv-sniffer. Severity is critical (CVSS 9.8). An issue was discovered in the csv-sniffer crate through 2021-01-05 for Rust. preamble_skipcount may read from uninitialized memory locations.

How urgent is CVE-2021-45686?

Priority 57/100. Critical severity; Remotely exploitable, no login, no user action

References

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