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CVE-2020-12011: A specially crafted communication packet sent to the affected systems could cause a denial-of-service conditio

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This week
CRITICAL 9.8REMOTEUPGRADEDOWNGRADEMITIGATE

CVE-2020-12011 is a critical-severity flaw (CVSS 9.8) affecting mc works, mc works32, energy analytix. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A specially crafted communication packet sent to the affected systems could cause a denial-of-service condition or allow remote code execution. This issue affects: Mitsubishi Electric MC Works64 version 4.02C (10.95.208.31) and earlier, all versions; MC Works32 version 3.00A (9.50.255.02); ICONICS GenBroker64, Platform Services, Workbench, FrameWorX Server version 10.96 and prior; GenBroker32 version 9.5 and prior.

Why this priority

  • Critical severity
  • EPSS top 2%: very likely to be exploited
  • Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score9.8 (Critical)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionNone
EPSS exploit chance29.2% (top 2%)
CISA exploited listNo
WeaknessCWE-787
Published2020-07-16
Last modified2026-06-17
Publisher (CNA): ICS-CERT · Vendor: iconics · mitsubishielectric

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

Am I affected?

Timeline

mitsubishielectric mc works UPGRADE
Affected: <= 10.95.208.31
Fixed in: newer than 10.95.208.31
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy mc-works || rpm -q mc-works || mc-works --version
2. UPGRADE to newer than 10.95.208.31 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade mc-works
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade mc-works
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
mitsubishielectric mc works32 DOWNGRADE
Affected: 9.50.255.02
Fixed in: no fixed release known
Safe to downgrade to: a release before 9.50.255.02
1. Check installed version
apt-cache policy mc-works32 || rpm -q mc-works32 || mc-works32 --version
2. No fixed release: DOWNGRADE to a release before 9.50.255.02 (Debian / Ubuntu)
apt-cache madison mc-works32 sudo apt install mc-works32=<VERSION_BEFORE_9.50.255.02> sudo apt-mark hold mc-works32
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list mc-works32 sudo dnf downgrade mc-works32-<VERSION_BEFORE_9.50.255.02> sudo dnf versionlock add mc-works32
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
iconics energy analytix MITIGATE
Affected: all versions
Fixed in: no fixed release known
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy energy-analytix || rpm -q energy-analytix || energy-analytix --version
No fixed or unaffected release known
Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.
iconics facility analytix MITIGATE
Affected: all versions
Fixed in: no fixed release known
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy facility-analytix || rpm -q facility-analytix || facility-analytix --version
No fixed or unaffected release known
Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.
iconics genesis64 MITIGATE
Affected: all versions
Fixed in: no fixed release known
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy genesis64 || rpm -q genesis64 || genesis64 --version
No fixed or unaffected release known
Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.
iconics hyper historian MITIGATE
Affected: all versions
Fixed in: no fixed release known
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy hyper-historian || rpm -q hyper-historian || hyper-historian --version
No fixed or unaffected release known
Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.
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-2020-12011?

mc works: upgrade to newer than 10.95.208.31; mc works32: downgrade or apply the listed mitigation; energy analytix: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-12011 being exploited?

CVE-2020-12011 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-2020-12011 affect?

CVE-2020-12011 affects mc works, mc works32, energy analytix. Severity is critical (CVSS 9.8). A specially crafted communication packet sent to the affected systems could cause a denial-of-service condition or allow remote code execution. This issue affects: Mitsubishi Electric MC Works64 version 4.02C (10.95.208.31) and earlier, all

How urgent is CVE-2020-12011?

Priority 64/100. Critical severity; EPSS top 2%: very likely to be exploited; Remotely exploitable, no login, no user action

Software pages

Mitsubishi Electric vulnerabilities

Related CVEs

References

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