EUVD-2026-94459
GHSA-2ghj-mr78-mh9p
Severity by source
AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Remote unauthenticated low-complexity trigger of an OOB read causing a process crash; impact is availability-only (A:H) with scope change affecting the device, no C/I 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 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-2026-76457 are related to out-of-bounds read issues that are grouped under the Common Weakness Enumeration (CWE) CWE-125.
AnalysisAI
Out-of-bounds read issues in Cisco NX-OS, NX-OS in ACI mode, and managed Cisco UCS software can be triggered by remote, unauthenticated attackers to cause a denial-of-service condition (process crash/restart) on affected devices. The CVSS 3.1 score is 8.6 (AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H), and exploitation is limited by reachability to the vulnerable management/control-plane service, which is often segmented on management VLANs or trusted networks. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Per the CVSS vector (AV:N/AC:L/PR:N/UI:N), no authentication, user interaction, or special privilege is required, and exploitation is remote against affected Cisco NX-OS, NX-OS in ACI mode, and UCS (managed) software. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H, base 8.6 HIGH) describes a remotely reachable, low-complexity, unauthenticated flaw with a scope change and pure availability impact - i.e. … 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 software hardening release described in Cisco advisory cisco-sa-hardening-nxosw1-cWzSbtR (https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-nxosw1-cWzSbtR); the available input does not provide an exact fixed version number, so the advisory is the authoritative source for release/version mapping. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, confirm which Cisco NX-OS, ACI-mode NX-OS, and managed Cisco UCS assets are in scope and verify whether their management/control-plane interfaces are reachable from untrusted networks; where they are, apply immediate access-control restrictions using management VLANs, ACLs, and firewall rules so only trusted administrative subnets can reach those services, and enable logging/alerting for unexpected process restarts or device reloads. …
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Same weakness CWE-125 – Out-of-bounds Read
View allSame technique Buffer Overflow
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External POC / Exploit Code
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