CVE-2026-73458: critical vulnerability in Arista Networks EOS
On affected platforms running Arista EOS with authenticated Bidirectional Forwarding Detection (BFD) sessions configured, a specially crafted packet can cause the BFD session(s) to go down. This may result in undesirable network changes because various rou
Published
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28Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 9.2epss 0.4%
On affected platforms running Arista EOS with authenticated Bidirectional Forwarding Detection (BFD) sessions configured, a specially crafted packet can cause the BFD session(s) to go down. This may result in undesirable network changes because various routing protocols monitor status on BFD session(s).
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:H
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%