EUVD-2026-94453
GHSA-f77q-jh4p-g2hw
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Network-reachable management plane (AV:N/AC:L) requiring valid low-privilege credentials (PR:L); CWE-707 injection yields full C/I/A on an unchanged scope.
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 NX-OS 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-2026-76453 are related to improper neutralization issues that are grouped under the Common Weakness Enumeration (CWE) CWE-707.
AnalysisAI
Improper neutralization of input in Cisco NX-OS software, NX-OS System Software running in ACI mode, and Cisco Unified Computing System (Managed) allows an authenticated attacker holding low-privilege credentials to reach high confidentiality, integrity, and availability impact against the affected device (CVSS 3.1: 8.8, AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H). The flaw surfaced during Cisco's internal security review and is remediated through a software hardening release rather than through an out-of-band emergency fix, which indicates internally discovered rather than customer-reported or externally exploited issues. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires pre-existing low-privilege access to the affected device (PR:L), consistent with an authenticated attacker on the NX-OS management/control plane of Cisco Nexus switches, NX-OS devices in ACI mode, or UCS Managed systems; no user interaction is needed and attack complexity is low. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a credible operational priority despite the absence of exploitation signals. … 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 | Apply the NX-OS software hardening release identified in Cisco's advisory (https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-nxosw1-cWzSbtR); the provided data does not include an exact fixed version string, so confirm the target release train against the advisory's fixed-software table before scheduling the upgrade, and note that NX-OS upgrades are disruptive to data-plane-adjacent services and require a maintenance window. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all affected Cisco NX-OS, ACI-mode, and UCS Managed devices and restrict management access to trusted networks. …
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External POC / Exploit Code
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