CVE-2026-76471: Heap-based Buffer Overflow in Cisco Cisco NX-OS Software
Description
A vulnerability in the NX-API feature of Cisco NX-OS Software could allow an unauthenticated, remote attacker to execute arbitrary code with root privileges or cause a denial of service (DoS) condition on an affected device. The vulnerability is due to insufficient input validation of data that is sent to the NX-API. An attacker could exploit this vulnerability by sending a crafted HTTP request to the NX-API of an affected device. A successful exploit could allow the attacker to execute arbitrary code with root privileges and could cause process crashes, which could result in a reload of the device and a DoS condition.
CVSS v3.1
Score 9.8critical
Affected software
Cisco
Cisco NX-OS Software
Cisco
Cisco Unified Computing System (Managed)
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in Cisco NX-OS Software's NX-API feature is caused by insufficient input validation of data sent to the API. An attacker can exploit this by sending a specially crafted HTTP request, resulting in a heap-based buffer overflow. Successful exploitation can lead to arbitrary code execution with root privileges or cause process crashes that may reload the device, causing denial of service. The CVSS 3.1 base score is 9.8, reflecting network attack vector, no privileges required, no user interaction, and high impact on confidentiality, integrity, and availability.
Potential Impact
An unauthenticated remote attacker can execute arbitrary code with root privileges on affected devices or cause a denial of service condition by triggering device reloads. This compromises device confidentiality, integrity, and availability.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or workaround information is provided in the available data.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- cisco
- Date Reserved
- 2026-08-19T12:02:03.638Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ac6748a2cdf04f656647335
Added to database: 10/07/2026, 16:34:18 UTC
Last enriched: 10/07/2026, 16:49:50 UTC
Last updated: 10/08/2026, 05:48:07 UTC
Views: 10
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