CVE-2020-18753Public exploitNetwork attack vector

Unauthenticated PLC control via crafted EPA packets

Published Aug 13, 2021 · Updated Aug 4, 2024

Missing authorization in DCCE MAC1100 PLC firmware allows remote attackers to stop or start the controller via crafted EPA packets. The UDP service on port 11000 accepts fixed EPA start and stop command packets and changes CPU state without authenticating or authorizing the sender. Network reachability to that service is sufficient, and stopping the CPU interrupts normal controller operation while starting it grants unauthorized operational control.

CVSS severity9.8
Critical
EPSS probability1.49%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in DCCE MAC1100 PLC firmware allows remote attackers to stop or start the controller via crafted EPA packets. The UDP service on port 11000 accepts fixed EPA start and stop command packets and changes CPU state without authenticating or authorizing the sender. Network reachability to that service is sufficient, and stopping the CPU interrupts normal controller operation while starting it grants unauthorized operational control.

The record

CVE
CVE-2020-18753
Published
Aug 13, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-862, T0855
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

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-862Missing Authorization
T0855Unauthorized Command Message

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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