EUVD-2026-80588
GHSA-383x-9pf8-56g8
Severity by source
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network pre-auth (AV:N/PR:N); AC:H reflects the crafted-packet timing and 'certain conditions'; S:C for full switch control affecting other systems; C/I/A:H for total takeover.
Primary rating from Vendor (Arista).
CVSS VectorVendor: Arista
Lifecycle Timeline
7DescriptionCVE.org
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.
AnalysisAI
Unauthenticated remote code execution affects Arista EOS platforms on which the non-default P4Runtime service has been explicitly enabled, letting an attacker who can reach that service take complete administrative control of the switch. The defect is a code-injection flaw (CWE-94) triggered by a crafted packet during P4Runtime session initiation, rated 9.5 Critical under CVSS 4.0 and assessed as CVSS 3.1 AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H, with high attack complexity and a changed scope because compromise of the switching platform can extend to subsequent systems. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the affected Arista EOS platform be explicitly configured with P4Runtime enabled - P4Runtime is DISABLED BY DEFAULT, so default installations are not exposed. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 4.0 rates this 9.5 (Critical), consistent with the CWE-94 code-injection outcome: an unauthenticated network attacker gains complete administrative control of the switch (VC/VI/VA:H plus subsequent-system SC/SI/SA:H). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply the fixed EOS release identified in Arista Security Advisory 0174 (https://www.arista.com/en/support/advisories-notices/security-advisory/24730-security-advisory-0174); the exact patched version is listed there and is not reproduced in the available intelligence, so verify the fix train for each affected platform before upgrading. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Arista EOS devices and determine which have the non-default P4Runtime service enabled; immediately disable P4Runtime on any switch where it is not explicitly required, and for those that require it, restrict reachable access to the service using management-plane ACLs or firewall rules limited to trusted hosts. …
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External POC / Exploit Code
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