CVE-2026-73450
MediumCVSS 6.9Exploitation Probability (EPSS)
Low risk3th percentile - higher than 3% of all known CVEs
Summary
On affected platforms running Arista EOS with MLAG Dual Primary Detection configured, an unauthenticated attacker with access to the Dual Primary Detection network segment can send specially crafted packets to interfere with the dual-primary state. If the MLAG primary switch fails while these packets are present, the secondary switch incorrectly concludes it is in a dual-primary condition and err-disables its interfaces, leading to a traffic interruption.
Risk Assessment
Traffic interruption may occur due to erroneous interface disabling, leading to service unavailability. The attack does not require authentication but requires access to the Dual Primary Detection network segment.
Recommendation
Restrict access to the Dual Primary Detection network segment to trusted devices and consider upgrading Arista EOS to a version containing the fix. Monitoring for unusual packets in this segment is also recommended.
Other vulnerabilities in Arista EOS
See all- CVE-2026-73462Medium
On affected platforms running Arista EOS with IGMP snooping configured (enabled by default on all VLANs), a network-adjacent unauthenticated attacker can send malformed network packets on an affected VLAN to cause the IGMP snooping agent to terminate unexpectedly. This results in a temporary disruption of multicast traffic management, which may cause multicast traffic to be flooded to all ports of the affected VLAN until the service recovers.
- CVE-2026-73457Medium
Under certain circumstances on affected platforms running Arista EOS with gRPC Network Packet Sampling Interface (gNPSI) enabled, the gNPSI client credentials might be logged in clear text in local or remote accounting logs to authenticated users.
- CVE-2026-73443Medium
On affected platforms running Arista EOS with VRRPv2 IP-AH authentication configured, an unauthenticated attacker within the same layer 2 network segment on which VRRP is running can capture a legitimate authenticated VRRP advertisement and replay it indefinitely. Replayed advertisements can be used to advertise stale VRRP state, for example to prevent a backup router from taking over the virtual gateway after the original master has gone down.
- CVE-2026-73442Low
On Arista EOS platforms with VRRP enabled, peer device VRRP authentication credentials are logged in cleartext. An authenticated user with sufficient privileges can read these credentials from agent trace logs or from a system receiving forwarded log output, without access to the network segment running VRRP.
- CVE-2026-77190Medium
On affected platforms running Arista EOS, an unauthenticated attacker who is network-adjacent to the switch and able to connect to a device with PIM Sparse Mode and MLAG configured can send malformed messages that cause the Pimsm agent to terminate unexpectedly. The agent is automatically restarted, but repeated attacks can cause continuous restarts and a sustained denial of service.
- CVE-2015-8236High
Arista EOS versions before 4.11.12, 4.12 before 4.12.11, 4.13 before 4.13.14M, 4.14 before 4.14.5FX.5, and 4.15 before 4.15.0FX1.1 allow remote attackers to execute arbitrary code as root by leveraging management-plane access.
- CVE-2026-73456Critical
Under certain circumstances on affected platforms running Arista EOS with gRPC Network Packet Sampling Interface (gNPSI) enabled, an unauthenticated gNPSI client can craft a malicious request to allow arbitrary code execution, granting an attacker full administrative control over the compromised switch.
- CVE-2026-86106Critical
An unauthenticated actor with network access to the private HA interconnect may trigger sensitive HA peer functions without verification. This could result in elevated command execution on Edge units where HA is enabled.
- CVE-2026-73453Critical
An unauthenticated P4Runtime client can achieve arbitrary code execution under certain conditions on affected platforms running Arista EOS configured with P4Runtime. By crafting a malicious packet during session initiation, an attacker can obtain complete administrative control over the switch.
- CVE-2026-73447Critical
A privileged attacker can exploit gNSI Certz service on Arista EOS-based products to escalate privileges and execute arbitrary OS commands via a crafted Certz Rotate request. The Bootz service is also affected.
Original NVD description (English source)
On affected platforms running Arista EOS with MLAG Dual Primary Detection configured, an unauthenticated attacker with access to the Dual Primary Detection network segment can send specially crafted packets to interfere with the dual-primary state. If the MLAG primary switch fails while these packets are present, the secondary switch incorrectly concludes it is in a dual-primary condition and err-disables its interfaces, leading to a traffic interruption.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS