Allocation of Resources Without Limits or Throttling in Cisco NX-OS Software - CVE-2026-20173
Published: October 8, 2026
Vulnerability identifier: #VU154011
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-20173
CWE-ID: CWE-770
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to exhaust system resources and cause a denial of service.
The vulnerability exists due to improperly applied rate limiting in the protocol handling of Cisco NX-OS Software when processing connections received on a data plane interface. A remote attacker can send a high rate of UDP or TCP connections to that interface to exhaust system resources and cause a denial of service.
Exploitation does not depend on device configuration.
Affected software
Cisco NX-OS Software
How to mitigate CVE-2026-20173
Install security update from vendor's website.
Cisco NX-OS Software - update to 8.4(13)