EUVD-2026-62565
GHSA-454f-rj63-3rwv
Severity by source
AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Missing authentication on a network-reachable critical function gives unauthenticated remote access (AV:N/AC:L/PR:N/UI:N) with a scope change and full C/I/A impact.
Primary rating from Vendor (cisco).
CVSS VectorVendor: cisco
Lifecycle Timeline
2DescriptionCVE.org
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.
AnalysisAI
Authentication bypass in Cisco Crosswork Planning (versions 7.0.0 through 7.2.0) lets remote unauthenticated attackers reach a critical function that lacks authentication (CWE-306), yielding full confidentiality, integrity, and availability compromise (CVSS 10.0). The flaw was internally discovered by Cisco during a proactive security hardening review rather than external reporting, and there is no public exploit identified at time of analysis. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires network reachability to the affected Cisco Crosswork Planning service (versions 7.0.0-7.2.0) and the ability to invoke the specific critical function that is missing an authentication check (CWE-306); per the CVSS vector AV:N/AC:L/PR:N/UI:N there are no special conditions - no credentials, no privileges, and no user interaction are needed against affected deployments. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The signals point to a genuine top-priority issue rather than an inflated high-CVSS score: CVSS 3.1 base is 10.0 with the most exploitable possible vector - AV:N (network), AC:L (low complexity), PR:N (no privileges), UI:N (no user interaction) - combined with full C/I/A impact and a scope change. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade to the fixed Cisco Crosswork Planning release identified in Cisco Security Advisory cisco-sa-hardening-crosswork-UzDTU9Vh (https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-crosswork-UzDTU9Vh); the exact fixed version was not present in the input data and must be read from that advisory (Patch available per vendor advisory). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify all Cisco Crosswork Planning instances running versions 7.0.0 through 7.2.0 and immediately restrict network access to authorized administrative networks only; implement firewall rules or network segmentation to block unauthenticated external connections; contact Cisco TAC for interim guidance. …
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External POC / Exploit Code
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