CVE-2026-73449: medium-severity vulnerability in Arista Networks EOS
On affected platforms running Arista EOS with both 802.1X port authentication and the RADIUS proxy feature configured with dynamic authorization, a low-privileged attacker on an adjacent network segment who induces a RADIUS packet through a configured RADI
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13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 5.9epss 0.2%
On affected platforms running Arista EOS with both 802.1X port authentication and the RADIUS proxy feature configured with dynamic authorization, a low-privileged attacker on an adjacent network segment who induces a RADIUS packet through a configured RADIUS proxy client can prevent RADIUS dynamic authorization messages, including Change-of-Authorization (CoA) and Disconnect-Requests as defined in RFC 5176, from being applied to locally authenticated 802.1X sessions.
This allows an endpoint session that a RADIUS server or network access control system has ordered disconnected to remain authorized on the network.
Both 802.1X port authentication with dynamic authorization and RADIUS proxy with dynamic authorization must be explicitly configured for a deployment to be exposed to this issue.
This issue was discovered internally by Arista, and the company is not aware of any malicious exploitation of this vulnerability in customer networks.
CVSS:4.0/AV:A/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:L/SA:L
Affected products
Arista Networks · EOSRelated CVEs — Arista Networks EOS
In the same product, most dangerous first.
CVE-2026-7473MEDIUMArista EOS Unexpected Tunnel Protocol Decapsulation and Forwarding BypassEPSS 1.1%KEVCVE-2024-27890HIGHOn affected platforms running Arista EOS with OpenConfig configured, a gNMI Set request can be run when it should have been rejected (No SSL Profiles Enabled).EPSS 4.4%CVE-2021-28506CRITICALAn issue has recently been discovered in Arista EOS where certain gNOI APIs incorrectly skip authorization and authentication which could potentially allow a factory reset of the device.EPSS 1.4%CVE-2021-28510MEDIUMFor certain systems running EOS, a Precision Time Protocol (PTP) packet of a management/signaling message with an invalid Type-Length-Value (TLV) causes the PTP agent to restart. Repeated restarts of the service will make the service unavailable.EPSS 1.0%CVE-2021-28505HIGHOn affected Arista EOS platforms, if a VXLAN match rule exists in an IPv4 access-list that is applied to the ingress of an L2 or an L3 port/SVI, the VXLAN rule and subsequent ACL rules in that access list will ignore the specified IP protocol.EPSS 0.9%CVE-2023-24511MEDIUMOn affected platforms running Arista EOS with SNMP configured, a specially crafted packet can cause a memory leak in the snmpd process.EPSS 0.8%