CVE-2021-31597

CRITICALNVD 9.49.4—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.4 under NVD CVSS v3. EPSS exploit probability: 2.1%, top 21% 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
Trending — 3 sources updated this week
9.4
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 2%CVSS: 9.4Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

The xmlhttprequest-ssl package before 1.6.1 for Node.js disables SSL certificate validation by default, because rejectUnauthorized (when the property exists but is undefined) is considered to be false within the https.request function of Node.js. In other words, no certificate is ever rejected.

CVSS v3
9.4
EG Score
9.4(medium)
EG Risk
48(Track)
EG Risk 48/100SSVC: 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
Severity94% × 45%
Exploitation2% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
79.3%
KEV
Not listed

Published

April 23, 2021

Last Modified

November 21, 2024

Advisory Details (3)

Auto-updated Jul 16, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit.
generic

NetApp Product Security

https://security.netapp.com/advisory/ntap-20210618-0004/
generic

Comparing v1.6.0...1.6.1 · mjwwit/node-XMLHttpRequest · GitHub

https://github.com/mjwwit/node-XMLHttpRequest/compare/v1.6.0...1.6.1
github_commit

commit bf53329b61ca (mjwwit/node-XMLHttpRequest)

Fix landed in mjwwit/node-XMLHttpRequest commit bf53329b61ca — awaiting tagged release

https://github.com/mjwwit/node-XMLHttpRequest/commit/bf53329b61ca6afc5d28f6b8d2dc2e3ca740a9b2

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFixed inDependents
xmlhttprequest-ssl—1.6.1—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 16× in last 7d / 45× 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.

  1. 2026-07-24 14:15 UTCEPSS rescore
  2. 2026-07-23 14:16 UTCEPSS rescore
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  4. 2026-07-23 02:00 UTCEG score recompute
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  14. 2026-07-18 21:29 UTCOSV refresh
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  1. 2026-07-11 08:25 UTCEPSS rescore
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  41. 2026-06-13 07:43 UTCOSV refresh
  42. 2026-06-12 23:10 UTCEPSS rescore
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  44. 2026-06-10 22:16 UTCEPSS rescore
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  70. 2026-05-26 17:32 UTCEG score recompute
  71. 2026-05-26 13:42 UTCEPSS rescore
  72. 2026-05-26 07:46 UTCOSV refresh
  73. 2026-05-26 07:17 UTCEPSS rescore
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Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2021-31597?
CVE-2021-31597 is a critical vulnerability published on April 23, 2021. The xmlhttprequest-ssl package before 1.6.1 for Node.js disables SSL certificate validation by default, because rejectUnauthorized (when the property exists but is undefined) is considered to be false within the https.request function of Node.js. In other words, no certificate is ever rejected.
When was CVE-2021-31597 disclosed?
CVE-2021-31597 was first published in the National Vulnerability Database on April 23, 2021, 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-2021-31597 actively exploited?
CVE-2021-31597 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 79.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2021-31597?
CVE-2021-31597 has a CVSS v3 base score of 9.4 (NVD).
How do I remediate CVE-2021-31597?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-31597, 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.

Dependency Blast Radius

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