CVE-2026-3823Network attack vector

Unauthenticated remote code execution via stack overflow

Published Mar 9, 2026 · Updated Mar 9, 2026

Stack-based buffer overflow in ATOP EHG2408 firmware before 3.36 allows remote attackers to execute arbitrary code over the network. ATOP and TWCERT identify a stack overflow but do not disclose the vulnerable service, input field, function, or unsafe copy operation. TWCERT reports no privileges or user interaction, while ATOP's earlier advisory requires user interaction; successful exploitation redirects program flow and runs code on the switch.

CVSS severity9.8
Critical
EPSS probability0.73%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in ATOP EHG2408 firmware before 3.36 allows remote attackers to execute arbitrary code over the network. ATOP and TWCERT identify a stack overflow but do not disclose the vulnerable service, input field, function, or unsafe copy operation. TWCERT reports no privileges or user interaction, while ATOP's earlier advisory requires user interaction; successful exploitation redirects program flow and runs code on the switch.

The record

CVE
CVE-2026-3823
Published
Mar 9, 2026
Updated
Mar 9, 2026
Vendor
ATOP Technologies, Inc.
Product
EHG2408-2SFP
Classifications
CWE-121, T1210
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 9, 2026Record 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=0 <3.36

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ATOP Technologies, Inc. · EHG2408-2SFPversion=0 <3.36
ATOP Technologies, Inc. · EHG2408version=0 <3.36

Published CVSS scores

9.8TWCERT/CCCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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.

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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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
T1210Exploitation of Remote Services

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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