CVE-2026-20237

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreHIGH confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-16. a secondary CVSS source baseline 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.1Exploit: None knownExposed: 0

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

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Identity Services Engine (ISE) and Cisco ISE Passive Identity Connector (ISE-PIC), engineering teams have conducted a comprehensive internal security review. This review resulted in a software hardening release that addresses multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-20237 are related to improper input validation issues that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-20.

CVSS v3
9.1
EG Score
9.1(high)
EG Risk
41(Track)
EG Risk 41/100SSVC: 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
Severity91% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
26%
KEV
Not listed

Published

September 16, 2026

Last Modified

September 18, 2026

Advisory Details (1)

Auto-updated Sep 16, 2026
⚠️ Active exploitation confirmed. No patch confirmed yet.
generic🔴 Active Exploitation

Cisco Identity Services Engine Hardening Release: September 2026

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-ise-XU5EwX5T

Vendor Advisories for CVE-2026-20237(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 29× in last 7d / 29× 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. 2026-09-19 10:08 UTCGHSA enrichment
  2. 2026-09-19 06:12 UTCGHSA enrichment
  3. 2026-09-19 02:14 UTCGHSA enrichment
  4. 2026-09-18 22:15 UTCEG score recompute
  5. 2026-09-18 22:15 UTCGHSA enrichment
  6. 2026-09-18 19:27 UTCEPSS rescore
  7. 2026-09-18 18:18 UTCGHSA enrichment
  8. 2026-09-18 14:21 UTCEG score recompute
  9. 2026-09-18 14:21 UTCGHSA enrichment
  10. 2026-09-18 13:44 UTCEG score recompute
  11. 2026-09-18 13:44 UTCGHSA enrichment
  12. 2026-09-18 12:28 UTCGHSA enrichment
  13. 2026-09-18 08:31 UTCGHSA enrichment
  14. 2026-09-18 04:34 UTCEG score recompute
  15. 2026-09-18 04:34 UTCGHSA enrichment
  16. 2026-09-18 04:04 UTCEG score recompute
  17. 2026-09-18 04:04 UTCGHSA enrichment
  18. 2026-09-18 02:12 UTCGHSA enrichment
  19. 2026-09-17 22:15 UTCEG score recompute
  20. 2026-09-17 22:15 UTCGHSA enrichment
  21. 2026-09-17 18:18 UTCGHSA enrichment
  22. 2026-09-17 12:53 UTCGHSA enrichment
  23. 2026-09-17 08:50 UTCGHSA enrichment
  24. 2026-09-17 04:53 UTCGHSA enrichment
  25. 2026-09-17 00:56 UTCEG score recompute
Show 4 more
  1. 2026-09-17 00:56 UTCGHSA enrichment
  2. 2026-09-16 20:31 UTCEG score recompute
  3. 2026-09-16 20:09 UTCEG score recompute
  4. 2026-09-16 20:09 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-20237?
CVE-2026-20237 is a critical vulnerability published on September 16, 2026. As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Identity Services Engine (ISE) and Cisco ISE Passive Identity Connector (ISE-PIC), engineering teams have conducted a comprehensive internal security review. This review resulted in a software hardening…
When was CVE-2026-20237 disclosed?
CVE-2026-20237 was first published in the National Vulnerability Database on September 16, 2026, with the most recent update on September 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-20237 actively exploited?
CVE-2026-20237 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 73.9% of all scored CVEs.
What is the CVSS score of CVE-2026-20237?
CVE-2026-20237 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2026-20237?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-20237, 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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