CVE-2026-73437
On affected platforms running Arista EOS with Dynamic Host Configuration Protocol (DHCP) relay configured, an unauthenticated attacker with network access could send a crafted DHCP reply packet from an IP address that is not configured as a helper/destinat
CVSS Score
9.6
EPSS Score
0.0%
EPSS Percentile
0th
On affected platforms running Arista EOS with Dynamic Host Configuration Protocol (DHCP) relay configured, an unauthenticated attacker with network access could send a crafted DHCP reply packet from an IP address that is not configured as a helper address, and the relay agent would forward it to clients without validating the source. This could allow the attacker to supply clients with malicious network configuration parameters, potentially resulting in traffic interception or denial of service for affected clients.
| CWE | CWE-345 |
| Vendor | arista networks |
| Product | eos |
| Published | Sep 15, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
Arista Networks / EOS
4.36.0 ≤ 4.36.1F 4.35.0 ≤ 4.35.5M 4.34.0 ≤ 4.34.7.1M 4.33.0 ≤ 4.33.9M
References
Credits
This issue was discovered internally by Arista.