CVE-2017-0904: The private_address_check ruby gem before 0.4.0 is vulnerable to a bypass due to use of Ruby's Resolv.getaddre

Q: How do I fix CVE-2017-0904?

private address check: upgrade to 0.4.0. Exact commands for each OS are on this page.

Q: Is CVE-2017-0904 being exploited?

CVE-2017-0904 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-2017-0904 affect?

CVE-2017-0904 affects private address check. Severity is high (CVSS 8.1). The private_address_check ruby gem before 0.4.0 is vulnerable to a bypass due to use of Ruby's Resolv.getaddresses method, which is OS-dependent and should not be relied upon for security measures, such as when used to blacklist private net

Q: How urgent is CVE-2017-0904?

Priority 54/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 8.1REMOTEUPGRADE

CVE-2017-0904 is a high-severity flaw (CVSS 8.1) affecting private address check. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The private_address_check ruby gem before 0.4.0 is vulnerable to a bypass due to use of Ruby's Resolv.getaddresses method, which is OS-dependent and should not be relied upon for security measures, such as when used to blacklist private network addresses to prevent server-side request forgery.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	2.4% (top 16%)
CISA exploited list	No
Weakness	CWE-242, CWE-755
Published	2017-11-13
Last modified	2026-06-17

Publisher (CNA): HackerOne · Vendor: private address check project

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

Am I affected?

Timeline

2017-11-13 17:29 UTCPublished CVE record published
2026-06-17 00:58 UTCUpdated Record last modified

private address check project private address check UPGRADE

Affected: < 0.4.0

Fixed in: 0.4.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy private-address-check || rpm -q private-address-check || private-address-check --version

2. UPGRADE to 0.4.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade private-address-check

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade private-address-check

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-2017-0904?

private address check: upgrade to 0.4.0. Exact commands for each OS are on this page.

Is CVE-2017-0904 being exploited?

CVE-2017-0904 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-2017-0904 affect?

CVE-2017-0904 affects private address check. Severity is high (CVSS 8.1). The private_address_check ruby gem before 0.4.0 is vulnerable to a bypass due to use of Ruby's Resolv.getaddresses method, which is OS-dependent and should not be relied upon for security measures, such as when used to blacklist private net

How urgent is CVE-2017-0904?

Priority 54/100. High severity; Remotely exploitable, no login, no user action

Software pages

Ruby vulnerabilities

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References

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