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CVE-2020-27267: KEPServerEX v6.0 to v6.9, ThingWorx Kepware Server v6.8 and v6.9, ThingWorx Industrial Connectivity (all versi

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CRITICAL 9.1REMOTEDOWNGRADEDOWNGRADEMITIGATE

CVE-2020-27267 is a critical-severity flaw (CVSS 9.1) affecting industrial gateway server, kepware kepserverex, opc-aggregator. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

KEPServerEX v6.0 to v6.9, ThingWorx Kepware Server v6.8 and v6.9, ThingWorx Industrial Connectivity (all versions), OPC-Aggregator (all versions), Rockwell Automation KEPServer Enterprise, GE Digital Industrial Gateway Server v7.68.804 and v7.66, and Software Toolbox TOP Server all 6.x versions, are vulnerable to a heap-based buffer overflow. Opening a specifically crafted OPC UA message could allow an attacker to crash the server and potentially

Why this priority

  • Critical severity
  • EPSS top 7%: very likely to be exploited
  • Remotely exploitable, no login, no user action

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

Risk facts

CVSS score9.1 (Critical)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionNone
EPSS exploit chance6.0% (top 7%)
CISA exploited listNo
WeaknessCWE-416, CWE-787
Published2021-01-14
Last modified2026-06-17
Publisher (CNA): ICS-CERT · Vendor: ge · ptc · rockwellautomation

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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

ge industrial gateway server DOWNGRADE
Affected: 7.66 · 7.68.804
Fixed in: no fixed release known
Safe to downgrade to: a release before 7.66
1. Check installed version
apt-cache policy industrial-gateway-server || rpm -q industrial-gateway-server || industrial-gateway-server --version
2. No fixed release: DOWNGRADE to a release before 7.66 (Debian / Ubuntu)
apt-cache madison industrial-gateway-server sudo apt install industrial-gateway-server=<VERSION_BEFORE_7.66> sudo apt-mark hold industrial-gateway-server
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list industrial-gateway-server sudo dnf downgrade industrial-gateway-server-<VERSION_BEFORE_7.66> sudo dnf versionlock add industrial-gateway-server
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.
ptc kepware kepserverex DOWNGRADE
Affected: 6.0 · 6.9
Fixed in: no fixed release known
Safe to downgrade to: a release before 6.0
1. Check installed version
apt-cache policy kepware-kepserverex || rpm -q kepware-kepserverex || kepware-kepserverex --version
2. No fixed release: DOWNGRADE to a release before 6.0 (Debian / Ubuntu)
apt-cache madison kepware-kepserverex sudo apt install kepware-kepserverex=<VERSION_BEFORE_6.0> sudo apt-mark hold kepware-kepserverex
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list kepware-kepserverex sudo dnf downgrade kepware-kepserverex-<VERSION_BEFORE_6.0> sudo dnf versionlock add kepware-kepserverex
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.
ptc opc-aggregator 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 opc-aggregator || rpm -q opc-aggregator || opc-aggregator --version
No fixed or unaffected release known
Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.
ptc thingworx industrial connectivity 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 thingworx-industrial-connectivity || rpm -q thingworx-industrial-connectivity || thingworx-industrial-connectivity --version
No fixed or unaffected release known
Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.
ptc thingworx kepware server DOWNGRADE
Affected: 6.8 · 6.9
Fixed in: no fixed release known
Safe to downgrade to: a release before 6.8
1. Check installed version
apt-cache policy thingworx-kepware-server || rpm -q thingworx-kepware-server || thingworx-kepware-server --version
2. No fixed release: DOWNGRADE to a release before 6.8 (Debian / Ubuntu)
apt-cache madison thingworx-kepware-server sudo apt install thingworx-kepware-server=<VERSION_BEFORE_6.8> sudo apt-mark hold thingworx-kepware-server
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list thingworx-kepware-server sudo dnf downgrade thingworx-kepware-server-<VERSION_BEFORE_6.8> sudo dnf versionlock add thingworx-kepware-server
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.
rockwellautomation kepserver enterprise DOWNGRADE
Affected: 6.6.504.0 · 6.9.572.0
Fixed in: no fixed release known
Safe to downgrade to: a release before 6.6.504.0
1. Check installed version
apt-cache policy kepserver-enterprise || rpm -q kepserver-enterprise || kepserver-enterprise --version
2. No fixed release: DOWNGRADE to a release before 6.6.504.0 (Debian / Ubuntu)
apt-cache madison kepserver-enterprise sudo apt install kepserver-enterprise=<VERSION_BEFORE_6.6.504.0> sudo apt-mark hold kepserver-enterprise
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list kepserver-enterprise sudo dnf downgrade kepserver-enterprise-<VERSION_BEFORE_6.6.504.0> sudo dnf versionlock add kepserver-enterprise
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.
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-2020-27267?

industrial gateway server: downgrade or apply the listed mitigation; kepware kepserverex: downgrade or apply the listed mitigation; opc-aggregator: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-27267 being exploited?

CVE-2020-27267 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-2020-27267 affect?

CVE-2020-27267 affects industrial gateway server, kepware kepserverex, opc-aggregator. Severity is critical (CVSS 9.1). KEPServerEX v6.0 to v6.9, ThingWorx Kepware Server v6.8 and v6.9, ThingWorx Industrial Connectivity (all versions), OPC-Aggregator (all versions), Rockwell Automation KEPServer Enterprise, GE Digital Industrial Gateway Server v7.68.804 and

How urgent is CVE-2020-27267?

Priority 60/100. Critical severity; EPSS top 7%: very likely to be exploited; Remotely exploitable, no login, no user action

Software pages

Rockwell Automation vulnerabilities

Related CVEs

References

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