CVE-2026-73437

CRITICALPre-NVD 9.69.6—
EchelonGraph scoreHIGH confidence

Score 9.6 from GitHub Security Advisory published 2026-09-16. a secondary CVSS source baseline 9.6; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
9.6EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.6Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
9.6
EG Score
9.6(high)
EG Risk
43(Track)
EG Risk 43/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity96% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
10%
KEV
Not listed

Published

September 15, 2026

Last Modified

September 17, 2026

Advisory Details (1)

Auto-updated Sep 17, 2026
No patch confirmed yet.
generic

Security Advisory 0156 - Arista

https://www.arista.com/en/support/advisories-notices/security-advisory/24712-security-advisory-0156

Vendor Advisories for CVE-2026-73437(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 39× in last 7d / 39× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-19 20:04 UTCGHSA enrichment
  2. 2026-09-19 15:56 UTCEG score recompute
  3. 2026-09-19 15:56 UTCGHSA enrichment
  4. 2026-09-19 11:46 UTCGHSA enrichment
  5. 2026-09-19 07:38 UTCGHSA enrichment
  6. 2026-09-19 03:30 UTCGHSA enrichment
  7. 2026-09-18 23:23 UTCEG score recompute
  8. 2026-09-18 23:23 UTCGHSA enrichment
  9. 2026-09-18 19:28 UTCEPSS rescore
  10. 2026-09-18 19:15 UTCGHSA enrichment
  11. 2026-09-18 15:06 UTCGHSA enrichment
  12. 2026-09-18 10:59 UTCGHSA enrichment
  13. 2026-09-18 06:51 UTCGHSA enrichment
  14. 2026-09-18 02:43 UTCGHSA enrichment
  15. 2026-09-17 22:34 UTCEG score recompute
  16. 2026-09-17 22:34 UTCGHSA enrichment
  17. 2026-09-17 18:23 UTCGHSA enrichment
  18. 2026-09-17 12:55 UTCGHSA enrichment
  19. 2026-09-17 08:28 UTCGHSA enrichment
  20. 2026-09-17 04:20 UTCEG score recompute
  21. 2026-09-17 04:20 UTCGHSA enrichment
  22. 2026-09-17 04:06 UTCEG score recompute
  23. 2026-09-17 04:06 UTCGHSA enrichment
  24. 2026-09-17 03:41 UTCGHSA enrichment
  25. 2026-09-16 23:33 UTCGHSA enrichment
Show 14 more
  1. 2026-09-16 19:25 UTCEG score recompute
  2. 2026-09-16 19:25 UTCGHSA enrichment
  3. 2026-09-16 19:12 UTCGHSA enrichment
  4. 2026-09-16 19:00 UTCGHSA enrichment
  5. 2026-09-16 14:52 UTCEG score recompute
  6. 2026-09-16 14:52 UTCGHSA enrichment
  7. 2026-09-16 14:08 UTCEPSS rescore
  8. 2026-09-16 10:43 UTCGHSA enrichment
  9. 2026-09-16 06:35 UTCGHSA enrichment
  10. 2026-09-16 02:28 UTCEG score recompute
  11. 2026-09-16 02:28 UTCGHSA enrichment
  12. 2026-09-15 22:20 UTCEG score recompute
  13. 2026-09-15 21:18 UTCEG score recompute
  14. 2026-09-15 21:17 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-73437?
CVE-2026-73437 is a critical vulnerability published on September 15, 2026. 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…
When was CVE-2026-73437 disclosed?
CVE-2026-73437 was first published in the National Vulnerability Database on September 15, 2026, with the most recent update on September 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-73437 actively exploited?
CVE-2026-73437 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 90.4% of all scored CVEs.
What is the CVSS score of CVE-2026-73437?
CVE-2026-73437 has a CVSS v3 base score of 9.6 (NVD).
How do I remediate CVE-2026-73437?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-73437, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-73437

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