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    CVE-2026-73438

    On affected platforms running Arista EOS with Open Shortest Path First version 3 (OSPFv3) configured, an unauthenticated attacker on the same OSPFv3 broadcast domain can send a specially crafted set of packets that can cause the Ospf3 agent to restart unexpectedly. The crash results in the loss of all OSPFv3 adjacencies on the affected device and may disrupt routing across the broader OSPF domain until the agent recovers. This issue was reported externally by Dravanet Inc., and Arista is not aware of any malicious exploitation of this vulnerability in customer networks.

    Published:Sep 16, 2026
    Last Modified:Sep 18, 2026
    EPS:Sep 16, 2026
    EPSS Score:0.00214
    CVSS Score:5.3

    Affected Products

    Vendor
    Arista
    Product
    Eos

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-617 Reachable Assertion

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-73462 (CVSS 7.1) — On affected platforms running Arista EOS with IGMP (Internet Group Management Protocol) snooping configured (e…
    CVE-2026-73457 (CVSS 6) — Under certain circumstances on affected platforms running Arista EOS with gRPC Network Packet Sampling Interfa…
    CVE-2026-73456 (CVSS 9.2) — Under certain circumstances on affected platforms running Arista EOS with gRPC Network Packet Sampling Interfa…
    CVE-2026-73442 (CVSS 2.1) — On affected platforms running Arista EOS with VRRP enabled, the peer device VRRP authentication credentials ar…
    CVE-2026-73443 (CVSS 5.3) — On affected platforms running Arista EOS with VRRPv2 IP-AH authentication configured, an unauthenticated attac…
    CVE-2026-77190 (CVSS 6) — On affected platforms running Arista EOS, an unauthenticated attacker who is network-adjacent to the switch an…
    CVE-2026-73468 (CVSS 7.1) — A specially crafted packet can cause the premature expiry of multicast forwarding state on affected interfaces…
    CVE-2026-73440 (CVSS 2.3) — On affected platforms running Arista EOS with Simple Network Management Protocol (SNMP) configured, SNMPv3 loc…
    CVE-2026-73469 (CVSS 6.9) — When specific platforms are using Arista EOS with a loose Unicast Reverse Path Forwarding (uRPF) configuration…
    CVE-2026-73453 (CVSS 9.5) — An unauthenticated P4Runtime (Programming Protocol-Independent Packet Processors Runtime) client can achieve a…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High