October 27, 2026

CVE Watchtower

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CVE-2026-73453NVD

Vulnerability Summary

An unauthenticated P4Runtime (Programming Protocol-Independent Packet Processors Runtime) client can achieve arbitrary code execution under certain conditions on affected platforms running Arista EOS configured with P4Runtime. P4Runtime is disabled by default in Arista EOS. By crafting a malicious packet during the initiation of a P4Runtime session, an attacker can obtain complete administrative control over the compromised switch.

This issue was discovered internally by Arista, and the company is not aware of any malicious exploitation of this vulnerability in customer networks.
Severity Level
CRITICAL(10.0)
Published Date
Sep 16, 2026
Last Modified
Sep 17, 2026
Exploitation Status
No confirmed exploitation yet
EPSS Score (30-Day)
0.70%Probability
Root Weakness (CWE)
CWE-94: Code Injection ↗
The software constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended syntax or behavior.
CVSS v4.0 Base Metrics — Score 9.5 (CRITICAL)
Attack VectorNetwork
Attack ComplexityLow
Attack RequirementsPresent
Privileges RequiredNone
User InteractionNone
Confidentiality (Vulnerable System)High
Integrity (Vulnerable System)High
Availability (Vulnerable System)High
Confidentiality (Subsequent System)High
Integrity (Subsequent System)High
Availability (Subsequent System)High
CVSS v3.1 Base Metrics — Score 10.0 (CRITICAL)
Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh

Affected & Patched Versions

Affected Versions
  • Arista Networks EOS >= 4.36.0F and <= 4.36.1F
  • Arista Networks EOS >= 4.35.0F and <= 4.35.5M
  • Arista Networks EOS >= 4.34.0F and <= 4.34.7M
  • Arista Networks EOS >= 4.33.0F and < 4.34.0F
  • 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 4.36.1F
  • Arista Networks EOS 4.35.5M
  • Arista Networks EOS 4.34.7M
  • Arista Networks EOS 4.34.0F
  • 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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🚫Ad-Free — Uninterrupted experience.
🎁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.
🚫Ad-Free — Uninterrupted experience.

External References