{"id":"CVE-2026-73463","title":"On affected platforms running Arista EOS, when multiple gRPC Network Security Interface (gNSI) transports are configured, a race condition in the gNSI Authz service may cause a policy rotation to fail silently","summary":"On affected platforms running Arista EOS, when multiple gRPC Network Security Interface (gNSI) transports are configured, a race condition in the gNSI Authz service may cause a policy rotation to fail silently. An authenticated user whos…","severity":"medium","cvss":5.3,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N","cwe":["CWE-362"],"vendor":"Arista Networks","product":"EOS","affected":["EOS >= 4.36.0F <= 4.36.0.1F","EOS >= 4.35.0F <= 4.35.5M","EOS >= 4.34.0F <= 4.34.7M","EOS >= 4.33.0F <= 4.33.8M","EOS >= 4.32.0F <= 4.32.11M","EOS >= 4.31.0F <= 4.31.10M"],"published":"2026-09-16","updated":"2026-09-16","sourceUpdated":"2026-09-16T19:08:50.420","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-73463","references":[{"url":"https://www.arista.com/en/support/advisories-notices/security-advisory/24725-security-advisory-0169","label":"psirt@arista.com"}],"tags":["nvd","cve.org"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-16T13:59:22.097938Z"},"ingestedAt":"2026-09-16T09:53:11.597Z","epss":0.00199,"epssPercentile":0.09993,"slug":"CVE-2026-73463","body":"## Overview\n\nOn affected platforms running Arista EOS, when multiple gRPC Network Security Interface (gNSI) transports are configured, a race condition in the gNSI Authz service may cause a policy rotation to fail silently. An authenticated user whose access was revoked by the new policy may retain unauthorized access to gRPC interfaces. This does not affect Bootz.\n\nThis issue was discovered internally by Arista, and the company is not aware of any malicious exploitation of this vulnerability in customer networks.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":29,"depthScoreParts":{"impact":29.2,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}