As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Crosswork engineering team has 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-2026-20357 are related to missing authentication for critical function issues that are grouped under the Common Weakness Enumeration (CWE) CWE-306.
CVE-2026-20357
CRITICALPre-NVD 10.010.0—Trending — 3 sources updated this week
EchelonGraph scoreHIGH confidence
Score 10.0 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-19. a secondary CVSS source baseline 10.0; sources differ by 0.0.
Triggered by: GitHub Security Advisory CVSS
Sources: ghsa, secondary
10.0EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: —CVSS: 10.0Exploit: None knownExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 10.0
- EG Score
- 10.0(high)
- EG Risk
- 50(Track)EG Risk 50/100SSVC: 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 computedSeverity100% × 45%Exploitation0% × 40%Automatability30% × 15%Action: Routine — remediate on your standard cadence. - EPSS PROB
- —
- EPSS %ILE
- —
- KEV
- Not listed
Published
August 19, 2026
Last Modified
August 19, 2026
Advisory Details (2)
Auto-updated Aug 19, 2026⚠️ Active exploitation confirmed. No patch confirmed yet.
generic
generic🔴 Active Exploitation
Cisco Crosswork Security Hardening Release: August 2026
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-crosswork-UzDTU9VhVendor Advisories for CVE-2026-20357(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 9× in last 7d / 9× 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.
- 2026-08-20 03:48 UTCGHSA enrichment
- 2026-08-19 23:33 UTCGHSA enrichment
- 2026-08-19 19:20 UTCEG score recompute
- 2026-08-19 19:20 UTCGHSA enrichment
- 2026-08-19 18:38 UTCEG score recompute
- 2026-08-19 18:38 UTCGHSA enrichment
- 2026-08-19 17:23 UTCEG score recompute
- 2026-08-19 16:22 UTCEG score recompute
- 2026-08-19 16:22 UTCMITRE cvelistV5first tracked
Frequently asked(4)
What is CVE-2026-20357?
CVE-2026-20357 is a critical vulnerability published on August 19, 2026. As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Crosswork engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening release that addresses multiple internally discovered vulnerabilities. The…
When was CVE-2026-20357 disclosed?
CVE-2026-20357 was first published in the National Vulnerability Database on August 19, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
What is the CVSS score of CVE-2026-20357?
CVE-2026-20357 has a CVSS v3 base score of 10.0 (NVD).
How do I remediate CVE-2026-20357?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-20357, 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
Explore the affected products and dependency analysis for CVE-2026-20357
Is Your Infrastructure Affected by CVE-2026-20357?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.