How severe is CVE-2017-0904?

CVE-2017-0904 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2017-0904 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-0904?

CVE-2017-0904 affects Private Address Check Project Private Address Check. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2017-0904?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2017-0904 published?

CVE-2017-0904 was published on 2017-11-13 and last updated on 2026-06-17.

CVE-2017-0904

CVE-2017-0904 is a high-severity vulnerability in Private Address Check Project Private Address Check with a CVSS 3.x base score of 8.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-755.

Key facts

Severity: High (CVSS 3.x base score 8.1)
CVSS v2: 6.8
EPSS exploit prediction: 2% (82nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-755
Affected product: Private Address Check Project Private Address Check
Published: 2017-11-13
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.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.
How severe is CVE-2017-0904?: CVE-2017-0904 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2017-0904 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-0904?: CVE-2017-0904 affects Private Address Check Project Private Address Check. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2017-0904?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2017-0904 published?: CVE-2017-0904 was published on 2017-11-13 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:private_address_check_project:private_address_check:*:*:*:*:*:ruby:*:*

More vulnerabilities in Private Address Check Project Private Address Check

CVE-2017-0909 — Critical (CVSS 9.8): The private_address_check ruby gem before 0.4.1 is vulnerable to a bypass due to an incomplete blacklist of common…
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