CVE-2020-35921: An issue was discovered in the miow crate before 0.3.6 for Rust

Routine

MEDIUM 5.5UPGRADE

CVE-2020-35921 is a medium-severity flaw (CVSS 5.5) affecting miow. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in the miow crate before 0.3.6 for Rust. It has false expectations about the std::net::SocketAddr memory representation.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.4% (top 66%)
CISA exploited list	No
Published	2020-12-31
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: miow 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

miow project miow UPGRADE

Affected: < 0.2.2 · >= 0.3.0 and < 0.3.6

Fixed in: 0.2.2, 0.3.6

Safe to downgrade to: a release before 0.3.0

1. Check installed version

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

2. UPGRADE to 0.2.2 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade miow

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 0.3.0 (Debian / Ubuntu)

apt-cache madison miow sudo apt install miow=<VERSION_BEFORE_0.3.0> sudo apt-mark hold miow

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

dnf --showduplicates list miow sudo dnf downgrade miow-<VERSION_BEFORE_0.3.0> sudo dnf versionlock add miow

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-2020-35921?

miow: upgrade to 0.2.2, 0.3.6. Exact commands for each OS are on this page.

Is CVE-2020-35921 being exploited?

CVE-2020-35921 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-2020-35921 affect?

CVE-2020-35921 affects miow. Severity is medium (CVSS 5.5). An issue was discovered in the miow crate before 0.3.6 for Rust. It has false expectations about the std::net::SocketAddr memory representation.

How urgent is CVE-2020-35921?

Priority 33/100. Public exploit reference

References

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