CVE-2025-8870

Device reload via DesignWare serial input

Published Nov 14, 2025 · Updated Nov 14, 2025

Denial of service in Arista Networks EOS 4.34.2FX on 710X Series devices allows attackers to trigger an unexpected device reload. The Synopsys DesignWare serial path mishandles certain console input, producing hung tasks and a kernel soft-lockup panic rather than recovering. Exploitation requires serial-interface access, including remote console-port access; ordinary network access cannot trigger the service interruption.

CVSS severity5.6
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Arista Networks EOS 4.34.2FX on 710X Series devices allows attackers to trigger an unexpected device reload. The Synopsys DesignWare serial path mishandles certain console input, producing hung tasks and a kernel soft-lockup panic rather than recovering. Exploitation requires serial-interface access, including remote console-port access; ordinary network access cannot trigger the service interruption.

The record

CVE
CVE-2025-8870
Published
Nov 14, 2025
Updated
Nov 14, 2025
Vendor
Arista Networks
Product
Arista EOS
Classifications
CWE-248, T1499.004
Attack vector
physical
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 14, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 14, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.34.2FX

What conditions does exploitation require?

Attack vectorphysical
Required privilegesunauthenticated

What is affected?

Arista Networks · Arista EOSversion=4.34.2FX

Published CVSS scores

4.9Arista NetworksCVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H
5.6Arista NetworksCVSS:4.0/AV:P/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorphysical
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-248Uncaught Exception
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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