Buffer overflow in Cisco Nx-Os Software
CVE-2026-76471
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Cisco Nx-Os Software — versions 10.3(1), 10.3(2), 10.3(3)
- Cisco Unified Computing System (Managed) — versions 4.0(1a), 4.0(1b), 4.0(1c)
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-76471?
- CVE-2026-76471 is a critical-severity vulnerability in Cisco Nx-Os Software, classified under Heap-based Buffer Overflow. CVSS score: 9.8/10. Published 2026-10-07.
- How severe is CVE-2026-76471?
- Critical severity. CVSS v3 base score is 9.8 out of 10.