CVE-2018-3759

mediumpriority · track · 15EPSS 0.007 · 52 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.68% (52nd) EPSS

CVSS 4.3 · medium

Is it mine?

3 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · nvd · osv

EPSS · scored 2026-10-27

private_address_check ruby gem before 0.5.0 is vulnerable to a time-of-check time-of-use (TOCTOU) race condition due to the address the socket uses not being checked. DNS entries with a TTL of 0 can trigger this case where the initial resolution is a public address but the subsequent resolution is a private address.

cvss

Technical severity, 0–10. One row per scoring source.

4.3

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–medium · 3.4–4.3

v2.04.3mediumAV:N/AC:M/Au:N/C:P/I:N/A:Nprimary · NVD / NIST USexploitability 8.6 · impact 2.9

v3.03.7lowCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:Nprimary · NVD / NIST USexploitability 2.2 · impact 1.4

v3.03.4lowCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-362USprimaryCWE-362US

affected products (3)

Products and version ranges known to be affected.

HackerOne private_address_check ruby gem≤ 0.5.0enisa_euvdEU
private address check project private address check< 0.5.0nvdUScpe:2.3:a:private_address_check_project:private_address_check:*:*:*:*:*:*:*:*
RubyGems private_address_check< 0.5.0osvUSpkg:gem/private_address_check

advisories (1)

Vendor and ecosystem advisories describing this.

GHSA-2xvj-j3qh-x8c3private_address_check contains race condition2018-07-31ghsa · osvUS
The private_address_check ruby gem before 0.5.0 is vulnerable to a time-of-check time-of-use (TOCTOU) race condition due to the address the socket uses not being checked. DNS entries with a TTL of 0 can trigger this case where the initial resolution is a public address but the subsequent resolution is a private address.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd osv NVD CVE.org MITRE

published 2018-06-13modified 2026-06-17

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references (3)

External citations — patches, advisories, analysis.

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