CVE-2017-17790

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-14. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 5.9%CVSS: 9.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

The lazy_initialize function in lib/resolv.rb in Ruby through 2.4.3 uses Kernel#open, which might allow Command Injection attacks, as demonstrated by a Resolv::Hosts::new argument beginning with a '|' character, a different vulnerability than CVE-2017-17405. NOTE: situations with untrusted input may be highly unlikely.

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
51
EG Risk 51/100

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed (value × EchelonGraph’s weight)
Severity98% × 45%
The EG Score, 9.8 of 10.
Exploitation6% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability30% × 15%
EchelonGraph's default before algorithm v3.4: CISA had not published Automatable for this CVE.
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* or Attend at high (mission-essential systems).
Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact total (CVSS ≥ 9.0). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from Vulnrichment. EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
5.9%
EPSS %ILE
93rd
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* or Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact total (CVSS ≥ 9.0). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from Vulnrichment. EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

Published

December 20, 2017

Last Modified

June 17, 2026

Advisory Details (9)

Auto-updated Oct 6, 2026
Patch available. Sources: redhat, github_pr.
redhatMentions a patch (unverified)

Affected: Red Hat Enterprise Linux 7.

https://access.redhat.com/errata/RHSA-2018:0378
generic

[SECURITY] [DSA 4259-1] ruby2.3 security update

https://www.debian.org/security/2018/dsa-4259
genericMentions a patch (unverified)

[SECURITY] [DLA 1421-1] ruby2.1 security update

https://lists.debian.org/debian-lts-announce/2018/07/msg00012.html
genericMentions a patch (unverified)

[SECURITY] [DLA 1221-1] ruby1.9.1 security update

https://lists.debian.org/debian-lts-announce/2017/12/msg00025.html
genericMentions a patch (unverified)

[SECURITY] [DLA 1222-1] ruby1.8 security update

https://lists.debian.org/debian-lts-announce/2017/12/msg00024.html
github_pr

Fixed command Injection

Upstream fix in progress (PR #1777 · ruby/ruby, state=closed)

https://github.com/ruby/ruby/pull/1777
redhatMentions a patch (unverified)
https://access.redhat.com/errata/RHSA-2018:0585
redhatMentions a patch (unverified)
https://access.redhat.com/errata/RHSA-2018:0584
redhatMentions a patch (unverified)
https://access.redhat.com/errata/RHSA-2018:0583

Patch Availability(5)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubunturuby2.3-tcltk (2.3.1-2~16.04.5) @ xenial2026-05-20ubuntu
redhatrh-ruby24-ruby-0:2.4.3-90.el72018-03-26redhat
redhatrh-ruby23-ruby-0:2.3.6-67.el72018-03-26redhat
redhatrh-ruby22-ruby-0:2.2.9-19.el72018-03-26redhat
redhatruby-0:2.0.0.648-33.el7_42018-02-28redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(4 across 3 ecosystems)
Debian:7(2)
PackageVulnerable rangeFix by version rangeDependents
ruby1.81.8.7.358-7 ... 1.8.7.358-7.1+deb7u4 (6 versions)
  • every version up to 1.8.7.358-7.1+deb7u5: fixed in 1.8.7.358-7.1+deb7u5
—
ruby1.9.11.9.3.194-8.1 ... 1.9.3.194-8.1+deb7u6 (6 versions)
  • every version up to 1.9.3.194-8.1+deb7u7: fixed in 1.9.3.194-8.1+deb7u7
—
Debian:8(1)
PackageVulnerable rangeFix by version rangeDependents
ruby2.12.1.5-2, 2.1.5-2+deb8u1, 2.1.5-2+deb8u2, 2.1.5-2+deb8u3
  • every version up to 2.1.5-2+deb8u4: fixed in 2.1.5-2+deb8u4
—
Debian:9(1)
PackageVulnerable rangeFix by version rangeDependents
ruby2.32.3.3-1, 2.3.3-1+deb9u1, 2.3.3-1+deb9u2
  • every version up to 2.3.3-1+deb9u3: fixed in 2.3.3-1+deb9u3
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(5)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 7× in last 7d / 21× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 86 of 159 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 14 repeat rows among the latest 100 are merged into the row they repeat. The 73 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-11 13:41 UTCEPSS rescoreEPSS 5.9% · 93rd percentile
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  1. 2026-09-04 13:56 UTCEPSS rescoreEPSS 5.9% · 92nd percentile
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  31. 2026-07-23 01:28 UTCEG score recompute
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Related CVEs(same product + same vendor + same CWE)

Frequently asked(5)

What is CVE-2017-17790?
CVE-2017-17790 is a critical-severity vulnerability; its CVE record was published on December 20, 2017. The lazy_initialize function in lib/resolv.rb in Ruby through 2.4.3 uses Kernel#open, which might allow Command Injection attacks, as demonstrated by a Resolv::Hosts::new argument beginning with a '|' character, a different vulnerability than CVE-2017-17405. NOTE: situations with untrusted input…
When was the CVE record for CVE-2017-17790 published?
The CVE record for CVE-2017-17790 was published on December 20, 2017. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of June 17, 2026; the record at its source may have been updated since.
Is CVE-2017-17790 actively exploited?
CVE-2017-17790 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 5.9% probability of exploitation in the next 30 days (93rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2017-17790?
CVE-2017-17790 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2017-17790?
A fix for CVE-2017-17790 is available: update to the fixed version the vendor names in its advisory.

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