Eos

On affected platforms running Arista EOS with OSPFv3 configured, a specially crafted packet can cause the OSFPv3 process to have high CPU utilization which may result in the OSFPv3 process being restarted. This may cause disruption in the OSFPv3 routes on the switch. This issue was discovered internally by Arista and is not aware of any malicious uses of this issue in customer networks.

Published: 2025-12-16T19:32:20.528Z
Updated: 2025-12-16T19:51:10.033Z

On affected platforms running Arista EOS, certain serial console input might result in an unexpected reload of the device.153

Published: 2025-11-14T15:57:04.673Z
Updated: 2025-11-14T16:29:13.516Z

On affected platforms running Arista EOS with MACsec configuration, a specially crafted packet can cause the MACsec process to terminate unexpectedly. Continuous receipt of these packets with certain MACsec configurations can cause longer term disruption of dataplane traffic.

Published: 2026-01-06T19:15:44.409Z
Updated: 2026-01-06T19:44:20.519Z

On affected platforms running Arista EOS, maliciously formed UDP packets with source port 3503 may be accepted by EOS. UDP Port 3503 is associated with LspPing Echo Reply. This can result in unexpected behaviors, especially for UDP based services that do not perform some form of authentication.

Published: 2025-08-25T20:14:23.427Z
Updated: 2025-08-27T14:53:30.181Z

On affected platforms running Arista EOS, the global common encryption key configuration may be logged in clear text, in local or remote accounting logs. Knowledge of both the encryption key and protocol specific encrypted secrets from the device running-config could then be used to obtain protocol specific passwords in cases where symmetric passwords are required between devices with neighbor protocol relationships.

Published: 2025-08-25T20:02:48.722Z
Updated: 2025-08-25T20:31:54.730Z

n affected platforms running Arista EOS, ACL policies may not be enforced. IPv4 ingress ACL, MAC ingress ACL, or IPv6 standard ingress ACL enabled on one or more ethernet or LAG interfaces may result in ACL policies not being enforced for ingress packets. This can cause incoming packets to incorrectly be allowed or denied. The two symptoms of this issue on the affected release and platform are: * Packets which should be permitted may be dropped and, * Packets which should be dropped may be permitted.

Published: 2025-05-27T22:22:51.717Z
Updated: 2025-05-28T13:34:08.151Z

On affected platforms with hardware IPSec support running Arista EOS with IPsec enabled and anti-replay protection configured, EOS may exhibit unexpected behavior in specific cases. Received duplicate encrypted packets, which should be dropped under normal anti-replay protection, will instead be forwarded due to this vulnerability. Note: this issue does not affect VXLANSec or MACSec encryption functionality.

Published: 2025-05-27T22:16:53.489Z
Updated: 2025-05-28T13:34:30.912Z

On affected platforms running Arista EOS with OpenConfig configured, a gNOI request can be run when it should have been rejected. This issue can result in unexpected configuration/operations being applied to the switch.

Published: 2025-03-04T19:49:00.278Z
Updated: 2025-03-04T20:41:46.732Z

On affected platforms running Arista EOS with OpenConfig configured, a gNOI request can be run when it should have been rejected. This issue can result in users retrieving data that should not have been available

Published: 2025-03-04T19:44:34.221Z
Updated: 2025-03-04T20:12:25.230Z

On affected platforms running Arista EOS with a gNMI transport enabled, running the gNOI File TransferToRemote RPC with credentials for a remote server may cause these remote-server credentials to be logged or accounted on the local EOS device or possibly on other remote accounting servers (i.e. TACACS, RADIUS, etc).

Published: 2025-05-07T22:52:25.444Z
Updated: 2025-05-08T13:02:27.046Z

On affected platforms running Arista EOS with Traffic Policies configured the vulnerability will cause received untagged packets not to hit Traffic Policy rules that they are expected to hit. If the rule was to drop the packet, the packet will not be dropped and instead will be forwarded as if the rule was not in place. This could lead to packets being delivered to unexpected destinations.

Published: 2025-05-08T19:14:00.226Z
Updated: 2025-08-25T19:52:14.674Z

On affected platforms running Arista EOS with BGP Link State configured, BGP peer flap can cause the BGP agent to leak memory. This may result in BGP routing processing being terminated and route flapping.

Published: 2025-03-04T20:12:02.025Z
Updated: 2025-03-04T20:34:15.951Z

On affected platforms running Arista EOS with 802.1X configured, certain conditions may occur where a dynamic ACL is received from the AAA server resulting in only the first line of the ACL being installed after an Accelerated Software Upgrade (ASU) restart. Note: supplicants with pending captive-portal authentication during ASU would be impacted with this bug.

Published: 2025-03-04T20:20:53.517Z
Updated: 2025-03-04T20:33:37.805Z

On affected platforms running Arista EOS with SNMP configured, if “snmp-server transmit max-size” is configured, under some circumstances a specially crafted packet can cause the snmpd process to leak memory. This may result in the snmpd process being terminated (causing SNMP requests to time out until snmpd is restarted) and memory pressure for other processes on the switch. Increased memory pressure can cause processes other than snmpd to be at risk for unexpected termination as well.

Published: 2025-01-10T20:19:10.234Z
Updated: 2025-01-14T14:33:54.850Z

On affected platforms running Arista EOS, a specially crafted packet with incorrect VLAN tag might be copied to CPU, which may cause incorrect control plane behavior related to the packet, such as route flaps, multicast routes learnt, etc.

Published: 2025-01-10T20:25:53.860Z
Updated: 2025-01-10T21:11:37.497Z

On affected platforms running Arista EOS, ingress traffic on Layer 2 ports may, under certain conditions, be improperly forwarded to ports associated with different VLANs, resulting in a breach of VLAN isolation and segmentation boundaries.

Published: 2025-05-27T22:11:30.325Z
Updated: 2025-05-28T13:34:52.088Z

On affected platforms running Arista EOS with mirroring to multiple destinations configured, an internal system error may trigger a kernel panic and cause system reload.

Published: 2023-08-29T16:31:57.668Z
Updated: 2024-09-30T17:44:07.777Z

On affected platforms running Arista EOS with VXLAN configured, malformed or truncated packets received over a VXLAN tunnel and forwarded in hardware can cause egress ports to be unable to forward packets. The device will continue to be susceptible to the issue until remediation is in place.

Published: 2023-08-29T16:13:10.451Z
Updated: 2024-09-30T17:46:19.199Z

On affected platforms running Arista CloudEOS an issue in the Software Forwarding Engine (Sfe) can lead to a potential denial of service attack by sending malformed packets to the switch. This causes a leak of packet buffers and if enough malformed packets are received, the switch may eventually stop forwarding traffic.

Published: 2023-04-12T00:00:00.000Z
Updated: 2025-02-07T15:50:41.522Z

On affected platforms running Arista CloudEOS an issue in the Software Forwarding Engine (Sfe) can lead to a potential denial of service attack by sending malformed packets to the switch. This causes a leak of packet buffers and if enough malformed packets are received, the switch may eventually stop forwarding traffic.

Published: 2023-04-12T00:00:00.000Z
Updated: 2025-02-07T15:47:10.611Z

On affected platforms running Arista EOS with SNMP configured, a specially crafted packet can cause a memory leak in the snmpd process. This may result in the snmpd processing being terminated (causing SNMP requests to time out until snmpd is automatically restarted) and potential memory resource exhaustion for other processes on the switch. The vulnerability does not have any confidentiality or integrity impacts to the system.

Published: 2023-04-12T00:00:00.000Z
Updated: 2025-02-07T15:47:42.435Z

This advisory documents the impact of an internally found vulnerability in Arista EOS for security ACL bypass. The impact of this vulnerability is that the security ACL drop rule might be bypassed if a NAT ACL rule filter with permit action matches the packet flow. This could allow a host with an IP address in a range that matches the range allowed by a NAT ACL and a range denied by a Security ACL to be forwarded incorrectly as it should have been denied by the Security ACL. This can enable an ACL bypass.

Published: 2022-08-05T16:47:31.584Z
Updated: 2026-06-02T14:07:52.943Z

For 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.

Published: 2023-01-24T00:00:00.000Z
Updated: 2025-04-01T18:44:26.214Z

An issue has recently been discovered in Arista EOS where, under certain conditions, the service ACL configured for OpenConfig gNOI and OpenConfig RESTCONF might be bypassed, which results in the denied requests being forwarded to the agent.

Published: 2022-01-14T19:04:51.398Z
Updated: 2024-09-17T04:20:33.347Z

An 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.

Published: 2022-01-14T19:04:50.282Z
Updated: 2024-09-16T22:09:48.017Z

On 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.

Published: 2022-04-14T20:05:50.059Z
Updated: 2024-09-16T16:58:06.559Z

On Arista Strata family products which have “TCAM profile” feature enabled when Port IPv4 access-list has a rule which matches on “vxlan” as protocol then that rule and subsequent rules ( rules declared after it in ACL ) do not match on IP protocol field as expected.

Published: 2022-04-01T22:17:50.000Z
Updated: 2024-08-03T21:47:32.630Z