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.

Published: 2017-11-13 Last update: 2026-05-13 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2017-0904 is rated Moderate Risk (58.7/100): CVSS High severity, with medium exploitation likelihood (EPSS 0.86%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2017-0904

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-03-04 0.77% 0.86% +0.10%
2 2026-03-01 0.86% 0.77% -0.10%
3 2026-02-04 — 0.86% —

Full EPSS history (33 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2017-0904

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.1 3.0 HIGH
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.2 5.9 [email protected]
6.8 2.0 MEDIUM
AV:N/AC:M/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 8.6 6.4 [email protected]

Weakness enumeration for CVE-2017-0904

GitHub Security Advisory for CVE-2017-0904

GHSA-hxhj-hp9m-qwc4 · Severity: medium · Ecosystem: rubygems — private_address_check vulnerable to bypass of Resolv.getaddresses method

Affected software / configurations for CVE-2017-0904

Vendor Product Version Raw CPE
private_address_check_project private_address_check < 0.4.0 cpe:2.3:a:private_address_check_project:private_address_check:*:*:*:*:*:ruby:*:*

References for CVE-2017-0904

URL Tags
https://edoverflow.com/2017/ruby-resolv-bug/ Issue Tracking Third Party Advisory
https://github.com/jtdowney/private_address_check/commit/58a0d7fe31de339c0117160567a5b33ad82b46af Third Party Advisory
https://github.com/jtdowney/private_address_check/issues/1 Issue Tracking Third Party Advisory
https://hackerone.com/reports/287245 Issue Tracking Mitigation Patch Third Party Advisory
https://hackerone.com/reports/287835 Permissions Required Third Party Advisory
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