arista-networksCVE-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...
Medium6.5CVE-2026-73437 · Published Sep 15, 2026 · updated Sep 17, 2026
Affected versions
| Package | Affected | Fixed in |
|---|---|---|
| EOS Vendor | >= 4.36.0, <= 4.36.1F | No fix yet |
| >= 4.35.0, <= 4.35.5M | No fix yet | |
| >= 4.34.0, <= 4.34.7.1M | No fix yet | |
| >= 4.33.0, <= 4.33.9M | No fix yet |
Details and references
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.
- CVSS 4.0
- CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
- Severity from
- no source yet
- Weakness
- CWE-345