CVE-2020-18756: An arbitrary memory access vulnerability in the EPA protocol of Dut Computer Control Engineering Co.'s PLC MAC

This week

HIGH 7.5REMOTEMITIGATE

CVE-2020-18756 is a high-severity flaw (CVSS 7.5) affecting mac1100 plc firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An arbitrary memory access vulnerability in the EPA protocol of Dut Computer Control Engineering Co.'s PLC MAC1100 allows attackers to read the contents of any variable area.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.3% (top 29%)
CISA exploited list	No
Weakness	CWE-125
Published	2021-08-13
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: dcce

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-08-13 17:15 UTCPublished CVE record published
2026-06-17 02:59 UTCUpdated Record last modified

dcce mac1100 plc firmware MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2020-18756?

mac1100 plc firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-18756 being exploited?

CVE-2020-18756 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2020-18756 affect?

CVE-2020-18756 affects mac1100 plc firmware. Severity is high (CVSS 7.5). An arbitrary memory access vulnerability in the EPA protocol of Dut Computer Control Engineering Co.'s PLC MAC1100 allows attackers to read the contents of any variable area.

How urgent is CVE-2020-18756?

Priority 54/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2020-18759 HIGH 7.5 MITIGATE An information disclosure vulnerability exists in the EPA protocol of Dut Computer Control Engineering Co.'s P
CVE-2020-18758 CRITICAL 9.8 MITIGATE An issue in Dut Computer Control Engineering Co.'s PLC MAC1100 allows attackers to execute arbitrary code.
CVE-2020-18757 HIGH 7.5 MITIGATE An issue in Dut Computer Control Engineering Co.'s PLC MAC1100 allows attackers to cause persistent denial of
CVE-2020-18754 HIGH 7.5 MITIGATE An information disclosure vulnerability exists within Dut Computer Control Engineering Co.'s PLC MAC1100.
CVE-2020-18753 CRITICAL 9.8 MITIGATE An issue in Dut Computer Control Engineering Co.'s PLC MAC1100 allows attackers to gain access to the system a

References

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