CVE-2020-27267Network attack vector

Crash and data disclosure via malformed OPC UA

Published Jan 13, 2021 · Updated Aug 4, 2024

Heap corruption in affected Kepware-based OPC UA servers allows remote attackers to crash the runtime or disclose data via a crafted message. The OPC UA interface mishandles certain crafted requests, causing a use-after-free and out-of-bounds heap write; no finer code-level locus is public. The interface is enabled by default, and successful exploitation can interrupt data acquisition or disclose process data without altering server data.

CVSS severity9.1
Critical
EPSS probability4.94%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap corruption in affected Kepware-based OPC UA servers allows remote attackers to crash the runtime or disclose data via a crafted message. The OPC UA interface mishandles certain crafted requests, causing a use-after-free and out-of-bounds heap write; no finer code-level locus is public. The interface is enabled by default, and successful exploitation can interrupt data acquisition or disclose process data without altering server data.

The record

CVE
CVE-2020-27267
Published
Jan 13, 2021
Updated
Aug 4, 2024
Vendor
PTC Inc.
Product
ThingWorx Industrial Connectivity
Classifications
CWE-416, CWE-787, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=All versions
  2. Affected versionversion=v6.8 and v6.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

PTC Inc. · ThingWorx Industrial Connectivityversion=All versions; version=v6.8 and v6.9
Software Toolbox · TOP Serverversion=All 6.x versions
Rockwell Automation · KEPServer Enterpriseversion=All versions
PTC Inc. · KEPServerEXversion=v6.0 to v6.9
GE Digital · Industrial Gateway Serverversion=v7.66; version=v7.68.804
PTC Inc. · OPC Aggregatorversion=All versions

Published CVSS scores

6.4NIST NVDAV:N/AC:L/Au:N/C:P/I:N/A:P
9.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

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 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 exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
CWE-787Out-of-bounds Write
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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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