CVE-2023-31147

MEDIUMNVD 5.95.9—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.9 under NVD CVSS v3. EPSS exploit probability: 0.9%, top 44% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
5.9EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 5.9Exploit: None knownExposed: 0

A fix is available — apply it.

c-ares is an asynchronous resolver library. When /dev/urandom or RtlGenRandom() are unavailable, c-ares uses rand() to generate random numbers used for DNS query ids. This is not a CSPRNG, and it is also not seeded by srand() so will generate predictable output. Input from the random number generator is fed into a non-compilant RC4 implementation and may not be as strong as the original RC4 implementation. No attempt is made to look for modern OS-provided CSPRNGs like arc4random() that is widely available. This issue has been fixed in version 1.19.1.

CVSS v3
5.9
EG Score
5.9(medium)
EG Risk
27(Track)
EG Risk 27/100SSVC: Track

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
Severity59% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
58%
KEV
Not listed

Published

May 25, 2023

Last Modified

November 21, 2024

References (10)

Patch Availability(8)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatc-ares-0:1.19.1-1.el92023-11-07redhat
redhatrh-nodejs14-nodejs-0:14.21.3-4.el72023-07-12redhat
redhatnodejs:16-8080020230608150024.63b345852023-07-12redhat
redhatnodejs:16-8060020230620060944.ad008a3a2023-07-12redhat
redhatnodejs-1:16.18.1-4.el9_02023-07-12redhat
redhatnodejs:18-8080020230607122508.63b345852023-07-12redhat
redhatnodejs:18-9020020230531092345.rhel92023-06-14redhat
redhatnodejs-1:16.19.1-2.el9_22023-06-14redhat

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 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
c-ares1.17.1-1 ... 1.34.8-1 (50 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
c-ares1.18.1-3 ... 1.34.8-1 (40 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
c-ares—1.19.1-2—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
c-ares—1.19.1-2—

Weakness Classification(1)

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

All Vendor Advisories

(9)

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 / 28× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. 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. Most recent first.

Showing the most recent 100 of 161 total refreshes for this CVE.

  1. 2026-09-07 15:59 UTCEPSS rescore
  2. 2026-09-06 13:45 UTCEPSS rescore
  3. 2026-09-05 15:25 UTCEPSS rescore
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  5. 2026-09-04 05:46 UTCOSV refresh
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  1. 2026-08-13 21:58 UTCEPSS rescore
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  30. 2026-07-23 02:22 UTCEG score recompute
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  45. 2026-07-15 16:56 UTCEPSS rescore
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  73. 2026-06-27 03:07 UTCEPSS rescore
  74. 2026-06-25 13:48 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2023-31147?
CVE-2023-31147 is a medium vulnerability published on May 25, 2023. c-ares is an asynchronous resolver library. When /dev/urandom or RtlGenRandom() are unavailable, c-ares uses rand() to generate random numbers used for DNS query ids. This is not a CSPRNG, and it is also not seeded by srand() so will generate predictable output. Input from the random number…
When was CVE-2023-31147 disclosed?
CVE-2023-31147 was first published in the National Vulnerability Database on May 25, 2023, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-31147 actively exploited?
CVE-2023-31147 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 42.5% of all scored CVEs.
What is the CVSS score of CVE-2023-31147?
CVE-2023-31147 has a CVSS v3 base score of 5.9 (NVD).
How do I remediate CVE-2023-31147?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-31147, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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