CVE-2018-20992: An issue was discovered in the claxon crate before 0.4.1 for Rust

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MEDIUM 6.5UPGRADE

CVE-2018-20992 is a medium-severity flaw (CVSS 6.5) affecting claxon. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in the claxon crate before 0.4.1 for Rust. Uninitialized memory can be exposed because certain decode buffer sizes are mishandled.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.4% (top 28%)
CISA exploited list	No
Weakness	CWE-908
Published	2019-08-26
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: claxon project

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

Am I affected?

Timeline

2019-08-26 13:15 UTCPublished CVE record published
2026-06-17 01:53 UTCUpdated Record last modified

claxon project claxon UPGRADE

Affected: >= 0.2.0 and <= 0.3.1 · 0.4.0

Fixed in: newer than 0.3.1

Safe to downgrade to: a release before 0.2.0

1. Check installed version

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

2. UPGRADE to newer than 0.3.1 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade claxon

Note

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

3. If no update is available yet, DOWNGRADE to a release before 0.2.0 (Debian / Ubuntu)

apt-cache madison claxon sudo apt install claxon=<VERSION_BEFORE_0.2.0> sudo apt-mark hold claxon

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list claxon sudo dnf downgrade claxon-<VERSION_BEFORE_0.2.0> sudo dnf versionlock add claxon

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-2018-20992?

claxon: upgrade to newer than 0.3.1. Exact commands for each OS are on this page.

Is CVE-2018-20992 being exploited?

CVE-2018-20992 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-2018-20992 affect?

CVE-2018-20992 affects claxon. Severity is medium (CVSS 6.5). An issue was discovered in the claxon crate before 0.4.1 for Rust. Uninitialized memory can be exposed because certain decode buffer sizes are mishandled.

How urgent is CVE-2018-20992?

Priority 41/100. No elevated risk signals yet.

References

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