CVE-2020-12002Network attack vector

Unauthenticated code execution via BwBacNetJ buffer overflow

Published May 8, 2020 · Updated Aug 4, 2024

Stack-based buffer overflow in Advantech WebAccess/SCADA 8.4.4 and earlier and 9.0.0 allows remote attackers to execute arbitrary code. The BwBacNetJ driver copies user-supplied data into a fixed-length stack buffer without first validating its length. No authentication is required, and successful exploitation runs code with Administrator privileges on the WebAccess Node.

CVSS severity9.8
Critical
EPSS probability9.08%
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 Advantech WebAccess/SCADA 8.4.4 and earlier and 9.0.0 allows remote attackers to execute arbitrary code. The BwBacNetJ driver copies user-supplied data into a fixed-length stack buffer without first validating its length. No authentication is required, and successful exploitation runs code with Administrator privileges on the WebAccess Node.

The record

CVE
CVE-2020-12002
Published
May 8, 2020
Updated
Aug 4, 2024
Vendor
Advantech
Product
WebAccess/SCADA
Classifications
CWE-121, CWE-787, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 8, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=WebAccess Node Version 8.4.4 and prior, WebAccess Node Version 9.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Advantech · WebAccess/SCADAversion=WebAccess Node Version 8.4.4 and prior, WebAccess Node Version 9.0.0

Published CVSS scores

7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P
9.8NIST NVDCVSS: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.

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-121Stack-based Buffer Overflow
CWE-787Out-of-bounds Write
T1190Exploit Public-Facing Application

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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