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Cisco Nexus Dashboard EUVDEUVD-2026-81094

| CVE-2026-20326 CRITICAL
Missing Authentication for Critical Function (CWE-306)
2026-09-16 cisco GHSA-7m45-wvmr-jx5q
9.8
CVSS 3.1 · Vendor: cisco
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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

  1. Access
    Reach exposed Nexus Dashboard interface
  2. Delivery
    Send request to unauthenticated critical function
  3. Exploit
    Bypass missing authentication check
  4. Execution
    Invoke privileged operation
  5. Impact
    Compromise dashboard and managed fabric

Vulnerability Assessment

Weakness
CWE
OWASP Top 10:2025
A07:2025 - Authentication Failures
ASVS 5.0
V6 - Authentication Authentication required for critical functions
MITRE ATT&CK

1 technique across 1 tactic: Initial Access

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

Exploitation Conditions

Exploitation requires network reachability to the management interface of a Cisco Nexus Dashboard deployment; per CWE-306 and PR:N, no credentials or user interaction are needed to reach the affected critical function(s) against a default installation. Limiting factors: Nexus Dashboard is a data-center management/automation appliance normally deployed on isolated or restricted management networks and not internet-exposed, so real-world reachability depends heavily on network segmentation. The advisory is a grouped hardening release, so the exact vulnerable function(s), affected/fixed software versions, and any per-issue configuration prerequisites are not specified in the available data and must be confirmed against the Cisco advisory.

Impact

The CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/C:H/I:H/A:H = 9.8 Critical) describes an unauthenticated, remotely reachable missing-authentication flaw (CWE-306) with full CIA impact, which on paper is a top-priority issue. However, several signals temper this: there is NO EPSS score, NO CISA KEV listing, and NO public POC, so exploitation is theoretical at time of analysis (no public exploit identified). Critically, this is a GROUPED hardening-release advisory in which 'multiple internally discovered vulnerabilities' were bundled under one CVE and CWE by Cisco's own engineering team - the C:H/I:H/A:H impact and 9.8 score are vendor-asserted from an internal review rather than derived from an external exploit or reproducible detail, so the precise attack surface and per-issue severity are not verifiable from the single advisory reference. The vulnerabilities were found internally and disclosed proactively, which typically means no adversary knowledge existed pre-patch. Net: treat as a genuine high-priority patch for exposed Nexus Dashboard instances given PR:N + AV:N + CWE-306, but the '9.8 with full CIA' should be read as a conservative worst-case umbrella rather than a confirmed single-primitive full-compromise. Management-plane products like Nexus Dashboard should not be internet-exposed, which further limits real-world reachability.

Exploit ScenarioDerived

An attacker with network access to a Cisco Nexus Dashboard management interface sends a request directly to a critical function that fails to enforce authentication, invoking a privileged operation without any credentials. Because the flaw requires no authentication, no user interaction, and low complexity, a single crafted request could expose data or alter dashboard/managed-fabric state. No public exploit code exists at time of analysis; the issues were discovered internally by Cisco.

Act Now Prioritize within 24-48h. Why: CRITICAL severity.
No patch listed yet 0.4% exploitation probability (EPSS)

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AnalysisAIv1 – Sep 16, 2026

Missing authentication for critical functions (CWE-306) in Cisco Nexus Dashboard allows unauthenticated, remote attackers to access protected functionality, resulting in a CVSS 9.8 (Critical) rating with high impact to confidentiality, integrity, and availability. No public exploit code has been identified at time of analysis, and real-world exploitation requires network reachability to the management interface, which is typically restricted to isolated management networks. The vulnerability is part of a Cisco hardening release addressing multiple internally discovered issues; exact affected versions and functions are not specified in available data.

RemediationAI

Apply the Cisco Nexus Dashboard hardening release referenced in the Cisco security advisory at https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-ndw1-psFvnrg; the exact patched version is not specified in the available data, so administrators should consult the advisory for the recommended software release and upgrade instructions. Because the flaw involves missing authentication for critical functions, no configuration workaround fully eliminates the risk; the most effective compensating control is to strictly limit network access to the Nexus Dashboard management interface using firewall rules, ACLs, or network segmentation, allowing only trusted administrative subnets. This reduces exposure but may hinder legitimate remote management; trade-offs include potential operational inconvenience for administrators who require access from broader networks. Additionally, monitor management-plane logs for unauthenticated access attempts to critical endpoints, and apply the patch as soon as it is available for the deployed version.

Affected VersionsENISA

Cisco Nexus Dashboard 3.0(1f)
Cisco Nexus Dashboard 3.3(2b)
Cisco Nexus Dashboard 2.3(2e)
Cisco Nexus Dashboard 2.3(2d)
Cisco Nexus Dashboard 3.2(1e)
Cisco Nexus Dashboard 2.1(1d)
Cisco Nexus Dashboard 2.3(2b)
Cisco Nexus Dashboard 3.2(2g)
Cisco Nexus Dashboard 3.1(1k)
Cisco Nexus Dashboard 2.3(1c)
Cisco Nexus Dashboard 2.1(2d)
Cisco Nexus Dashboard 3.0(1i)
Cisco Nexus Dashboard 3.1(1l)
Cisco Nexus Dashboard 4.2.1
Cisco Nexus Dashboard 3.2(1i)
Cisco Nexus Dashboard 3.2(2m)
Cisco Nexus Dashboard 2.2(1h)
Cisco Nexus Dashboard 3.1(1n)
Cisco Nexus Dashboard 2.1(2f)
Cisco Nexus Dashboard 3.2(2f)
Cisco Nexus Dashboard 2.3(2c)
Cisco Nexus Dashboard 2.1(1e)
Cisco Nexus Dashboard 2.2(2d)
Cisco Nexus Dashboard 4.1(1g)
Cisco Nexus Dashboard 3.3(1b)
Cisco Nexus Dashboard 2.2(1e)
Cisco Nexus Dashboard 3.3(2g)
Cisco Nexus Dashboard 4.0(1i)
Cisco Nexus Dashboard 3.3(1a)

Affected Packages

euvd cisco_nexus_dashboard no fix

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

The vulnerability class is CWE-306: Missing Authentication for Critical Function, meaning one or more critical operations within Cisco Nexus Dashboard can be invoked without any authentication. The CVSS 3.1 vector AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H indicates the flaw is network-reachable, requires no privileges or user interaction, and has full impact on confidentiality, integrity, and availability. Cisco Nexus Dashboard is a data-center management and automation platform that consolidates monitoring, configuration, and orchestration across multiple fabrics; the affected critical functions are likely administrative APIs or management endpoints exposed on the management interface. The CPE cpe:2.3:a:cisco:cisco_nexus_dashboard:*:*:*:*:*:*:*:* uses a wildcard for the version, suggesting all versions may be affected, but the Cisco advisory is a grouped hardening release that does not enumerate specific vulnerable versions or functions in the available data. Because Nexus Dashboard is normally deployed on isolated or restricted management networks, exploitability depends heavily on network segmentation and reachability to the management plane.

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Severity by source

Vendor (cisco) PRIMARY 9.8 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
vuln.today AI 9.8 CRITICAL

CWE-306 missing authentication for a critical function reachable over the network justifies AV:N/AC:L/PR:N/UI:N; full CIA retained as vendor-asserted worst case for the grouped management-plane issues, S:U.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (cisco).

CVSS VectorVendor: cisco

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

DescriptionCVE.org

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Nexus Dashboard 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-2026-20326 are related to missing authentication for critical function issues that are grouped under the Common Weakness Enumeration (CWE) CWE-306.

Executive ViewAI

Why It Matters

Cisco Nexus Dashboard, the centralized management platform used to operate Cisco data center networking fabrics, is affected by a critical-severity flaw (CVE-2026-20326) that lets a remote attacker reach protected functions without authenticating, placing the confidentiality, integrity, and availability of the managed network estate at risk. No vendor-released patch has been identified, and no public exploit code has been identified at time of analysis, though real-world abuse would require network reachability to the management interface. Leadership should care because Nexus Dashboard is a high-privilege control point: unauthorized access could give an attacker broad visibility into and control over data center network configuration.

Business Impact: High
Compensating Controls

No vendor-released patch identified at time of analysis. Interim mitigations: restrict management-interface reachability to isolated management networks via firewall rules and ACLs, prohibit internet exposure, require named administrative accounts with multi-factor authentication and access through hardened jump hosts, and enable logging and monitoring for authentication and configuration changes on Nexus Dashboard to detect unauthorized access attempts.

Threat Intelligence Overview

EPSS Score
0.4%
Top 67% exploitable
Prevalence
Medium
Cisco data-center operations/automation platform for ACI/Nexus fabrics, widely deployed but product-specific
Data Quality
3 sources
Confidence: Low

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity CRITICAL
CISA KEV No
Public POC No
EPSS 0.4%
Patch available No
Active threat No
Deciding rule
CRITICAL severity
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation· derived
None
System Exposure· derived
Open
Automatable· derived
Yes
Human Impact
High

Priority Score

49
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +49
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.

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