CVE-2019-17383: The netaddr gem before 2.0.4 for Ruby has misconfigured file permissions, such that a gem install may result i

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CRITICAL 9.8REMOTEUPGRADE

CVE-2019-17383 is a critical-severity flaw (CVSS 9.8) affecting netaddr. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The netaddr gem before 2.0.4 for Ruby has misconfigured file permissions, such that a gem install may result in 0777 permissions in the target filesystem.

Why this priority

Critical severity
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	2.4% (top 16%)
CISA exploited list	No
Weakness	CWE-276
Published	2019-10-09
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: netaddr project

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

Am I affected?

Timeline

2019-10-09 16:15 UTCPublished CVE record published
2026-06-17 02:23 UTCUpdated Record last modified

netaddr project netaddr UPGRADE

Affected: >= 1.5.0 and < 1.5.3 · >= 2.0 and < 2.0.4

Fixed in: 1.5.3, 2.0.4

Safe to downgrade to: a release before 1.5.0

1. Check installed version

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

2. UPGRADE to 1.5.3 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade netaddr

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 1.5.0 (Debian / Ubuntu)

apt-cache madison netaddr sudo apt install netaddr=<VERSION_BEFORE_1.5.0> sudo apt-mark hold netaddr

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

dnf --showduplicates list netaddr sudo dnf downgrade netaddr-<VERSION_BEFORE_1.5.0> sudo dnf versionlock add netaddr

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-2019-17383?

netaddr: upgrade to 1.5.3, 2.0.4. Exact commands for each OS are on this page.

Is CVE-2019-17383 being exploited?

CVE-2019-17383 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-2019-17383 affect?

CVE-2019-17383 affects netaddr. Severity is critical (CVSS 9.8). The netaddr gem before 2.0.4 for Ruby has misconfigured file permissions, such that a gem install may result in 0777 permissions in the target filesystem.

How urgent is CVE-2019-17383?

Priority 60/100. Critical severity; Remotely exploitable, no login, no user action

Software pages

Ruby vulnerabilities

References

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