CVE-2020-18758Public exploitNetwork attack vector

Remote code execution via unauthenticated EPA upload

Published Aug 13, 2021 · Updated Aug 4, 2024

Remote code execution in Dut Computer Control Engineering MAC1100 PLC allows remote attackers to overwrite control logic via EPA packets. The UDP service on port 11000 accepts an unauthenticated EPA upload sequence and writes the supplied program into OB1, replacing the controller's original logic. Network access to port 11000 is sufficient; successful exploitation changes physical process logic and can interrupt normal PLC operation.

CVSS severity9.8
Critical
EPSS probability2.68%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Remote code execution in Dut Computer Control Engineering MAC1100 PLC allows remote attackers to overwrite control logic via EPA packets. The UDP service on port 11000 accepts an unauthenticated EPA upload sequence and writes the supplied program into OB1, replacing the controller's original logic. Network access to port 11000 is sufficient; successful exploitation changes physical process logic and can interrupt normal PLC operation.

The record

CVE
CVE-2020-18758
Published
Aug 13, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-77, T0889
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 13, 2021CVE 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

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
10.0NVDAV:N/AC:L/Au:N/C:C/I:C/A:C

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 exploitPublished

Weakness, pattern, technique

CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
T0889Modify Program

Public exploit references

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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