Riskcovery

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

State
Published
Severity
6.5 Medium
Published
Sep 15, 2026
Updated
Sep 17, 2026
Reserved
Aug 12, 2026

Read the record on cve.org

Description

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.

Scores

CVSSScoreVectorSource
4.06.5 MediumCVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:H/SI:H/SA:HArista
3.19.6 CriticalCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:HArista

Weaknesses

  • CWE-345 Insufficient Verification of Data Authenticity

Affected Products

ProductVersions
EOSArista Networks
  • 4.36.0 through 4.36.1FAffectedfrom 4.36.2FNot affected
  • 4.35.0 through 4.35.5MAffectedfrom 4.35.6MNot affected
  • 4.34.0 through 4.34.7.1MAffectedfrom 4.34.8MNot affected
  • 4.33.0 through 4.33.9MAffectedfrom 4.33.10MNot affected

References

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