CVE-2023-3646Network attack vector

Switch reload via sand-dma out-of-bounds read

Published Aug 29, 2023 · Updated Sep 30, 2024

Out-of-bounds read in Arista EOS 4.28.2F through 4.28.5.1M and 4.29.0 through 4.29.1F allows remote attackers to reload switches. The sand-dma fab_sand_hdrinfo path dereferences a null address during interrupt processing, causing a fatal kernel panic. Affected R3 hardware must have Ethernet-port mirroring to multiple destinations and the underlying forwarding-table fault; exploitation interrupts service by reloading the switch.

CVSS severity5.9
Medium
EPSS probability0.67%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in Arista EOS 4.28.2F through 4.28.5.1M and 4.29.0 through 4.29.1F allows remote attackers to reload switches. The sand-dma fab_sand_hdrinfo path dereferences a null address during interrupt processing, causing a fatal kernel panic. Affected R3 hardware must have Ethernet-port mirroring to multiple destinations and the underlying forwarding-table fault; exploitation interrupts service by reloading the switch.

The record

CVE
CVE-2023-3646
Published
Aug 29, 2023
Updated
Sep 30, 2024
Vendor
Arista Networks
Product
Arista EOS
Classifications
CWE-125, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 29, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 30, 2024Record 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=4.28.2F <=4.28.5.1M
  2. Affected versionversion=4.29.0 <=4.29.1F

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Arista Networks · Arista EOSversion=4.28.2F <=4.28.5.1M; version=4.29.0 <=4.29.1F

Published CVSS scores

5.9Arista Networks, Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

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

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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