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Back to active CVEs
Medium · CVSS 6.5CVE-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/destinatCVE-2026-73437

Answer in brief

CVE-2026-73437 records a Medium severity (CVSS 6.5) vulnerability in 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. The current sources do not mark it as known exploited. The current feed maps Arista Networks/EOS (generic), Arista Networks/EOS (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 15, 2026Updated Sep 17, 2026Source checked Oct 31, 2026First seen by HOL Sep 15, 2026Material review Sep 17, 2026
Upstream Advisory

Record context

Vulnerability class
Missing Auth
EPSS
Not reported
CWE IDs
CWE-345
Source
CVE List V5
Source checked
Oct 31, 2026
References
1 linked source
Open source record

Key facts

Risk
Medium · CVSS 6.5
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Not reported

Why this deserves its current priority

CVSS is 6.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Arista Networks/EOS (generic), Arista Networks/EOS (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Arista Networks/EOSgeneric>=4.36.0 <=4.36.1F || >=4.35.0 <=4.35.5M || >=4.34.0 <=4.34.7.1M || >=4.33.0 <=4.33.9MNot reported
Arista Networks/EOSgeneric4.36.0 || 4.35.0 || 4.34.0 || 4.33.0Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Arista Networks/EOS, Arista Networks/EOS.
  2. 2Review the reported fix. Source-reported solution: The recommended resolution is to upgrade to a remediated software version at your earliest convenience and enable the reply source-address validation CLI knob under dhcp relay mode: switch(config)# dhcp relay switch(config-dhcp-relay)# reply source-address validation CVE-2026-73437 has been fixed in the following releases: * 4.36.2F and later releases in the 4.36.x train * 4.35.6M and later releases in the 4.35.x train * 4.34.8M and later releases in the 4.34.x train * 4.33.10M and later releases in the 4.33.x train Note: All versions require upgrading to a release containing the fix (as listed above) and applying the required configuration. Arista will not be providing any hotfixes.

Evidence timeline and material changes

  1. Published upstream

    Sep 15, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Sep 17, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Sep 15, 2026

Sources and claim methodology

  • Source referencearista.com
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • ActivityPub Undo handler can unfollow or remove reposts on behalf of other accountsAlso CWE-345