November 10, 2026

CVE Watchtower

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CVE-2026-121370NVD

Vulnerability Summary

On affected platforms running Arista EOS with Precision Time Protocol (PTP) configured, an unauthenticated attacker with network access to a PTP-enabled port can create a denial of service (DoS) condition by sending traffic to the system.
Severity Level
CRITICAL(9.2)
Published Date
Nov 10, 2026
Last Modified
Nov 10, 2026
Exploitation Status
No confirmed exploitation yet
EPSS Score (30-Day)
Data Pending
Root Weakness (CWE)
CWE-770: Unknown/Unlisted Weakness ↗
Refer to the official MITRE database for detailed architectural specifications regarding this weakness.
CVSS v4.0 Base Metrics — Score 9.2 (CRITICAL)
Attack VectorNetwork
Attack ComplexityLow
Attack RequirementsNone
Privileges RequiredNone
User InteractionNone
Confidentiality (Vulnerable System)None
Integrity (Vulnerable System)None
Availability (Vulnerable System)High
Confidentiality (Subsequent System)None
Integrity (Subsequent System)None
Availability (Subsequent System)High
CVSS v3.1 Base Metrics — Score 8.6 (HIGH)
Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeChanged
ConfidentialityNone
IntegrityNone
AvailabilityHigh

Affected & Patched Versions

Affected Versions
  • Arista Networks EOS >= 4.34.0F and <= 4.34.1F
  • Arista Networks EOS >= 4.33.0F and <= 4.33.8M
  • Arista Networks EOS >= 4.32.0F and < 4.33.0F
  • Arista Networks EOS >= 4.31.0F and < 4.32.0F
  • Arista Networks EOS >= 4.30.0F and < 4.31.0F
  • Arista Networks EOS >= 4.29.2F and < 4.30.0F
Patched Versions
  • Arista Networks EOS 4.34.1F
  • Arista Networks EOS 4.33.8M
  • Arista Networks EOS 4.33.0F
  • Arista Networks EOS 4.32.0F
  • Arista Networks EOS 4.31.0F
  • Arista Networks EOS 4.30.0F
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🎁7-Day Free Trial — Try Pro or Team, no card required.
📧Email Delivery — Threat intel straight to your inbox.
♾️Unlimited Vendors — Track your entire stack.
🚨All New CVEs — Be the first to know.
📈EPSS Spike Alerts — Catch rising risk before it peaks.
🎯Custom EPSS/CVSS — Filter noise, focus on risk.
🛡️Exploit Intel — A 2nd confirmed-exploit signal beyond KEV.
🐙GitHub Issues — Auto-tracked, no duplicates.
📬Weekly Digest — One clean summary, not inbox spam.
🏷️Watchlist Groups — Tag alerts by team (Infra/AppSec/SOC).
💬Webhooks — Slack & Teams integration.
🔀Smart Routing — Critical alerts to one channel, rest to another.
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External References