Arista: >> Eos >> 4.11.11 Security Vulnerabilities
CVE-2026-7473
On affected platforms running Arista EOS where a tunnel decapsulation configuration—such as VXLAN (Virtual Extensible LAN), decap-groups, or a GRE (Generic Routing Encapsulation) tunnel interface—is present, the switch will incorrectly decapsulate and forward other unexpected tunneled packet with a destination IP matching its configured decapsulation IP. This occurs because the switch does not verify the tunnel protocol type, potentially leading to the unexpected processing of non-configured tunnel traffic.
This issue has been reported as being exploited in the wild.
Known exploited
CVSS Score
6.9
EPSS Score
0.008
Published
2026-06-05
On the affected platforms running EOS, a malformed DHCP packet might cause the DHCP relay agent to restart.
CVSS Score
7.5
EPSS Score
0.006
Published
2023-06-05
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.
CVSS Score
5.3
EPSS Score
0.01
Published
2023-01-26
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.
CVSS Score
5.8
EPSS Score
0.005
Published
2022-08-05
An issue has recently been discovered in Arista EOS where the incorrect use of EOS's AAA API’s by the OpenConfig and TerminAttr agents could result in unrestricted access to the device for local users with nopassword configuration.
CVSS Score
9.1
EPSS Score
0.009
Published
2022-01-14
Arista EOS before 4.21.12M, 4.22.x before 4.22.7M, 4.23.x before 4.23.5M, and 4.24.x before 4.24.2F allows remote attackers to cause traffic loss or incorrect forwarding of traffic via a malformed link-state PDU to the IS-IS router.
CVSS Score
7.5
EPSS Score
0.013
Published
2020-10-26
utility.c in telnetd in netkit telnet through 0.17 allows remote attackers to execute arbitrary code via short writes or urgent data, because of a buffer overflow involving the netclear and nextitem functions.
CVSS Score
9.8
EPSS Score
0.745
Published
2020-03-06
Go before 1.12.11 and 1.3.x before 1.13.2 can panic upon an attempt to process network traffic containing an invalid DSA public key. There are several attack scenarios, such as traffic from a client to a server that verifies client certificates.
CVSS Score
7.5
EPSS Score
0.047
Published
2019-10-24
Arista EOS through 4.21.0F allows a crash because 802.1x authentication is mishandled.
CVSS Score
6.5
EPSS Score
0.006
Published
2019-08-15
Arista EOS before 4.20.2F allows remote BGP peers to cause a denial of service (Rib agent restart) via a malformed path attribute in an UPDATE message.
CVSS Score
7.5
EPSS Score
0.013
Published
2018-04-12
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