HOMEVULNERABILITIESCVE-2020-27263
CRITICAL

CVE-2020-27263

CWE-122Published: January 14, 2021· Updated: Jun 17, 2026

9.1
CVSS v3.1

Official Description

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, 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 leak data.

NVD Source

Technical Analysis

CVE-2020-27263 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), availability disruption (denial of service), with a CVSS base score of 9.1.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Affected Vendors & Products

ge1 product(s)
industrial gateway server
ptc4 product(s)
kepware kepserverexopc-aggregatorthingworx industrial connectivitythingworx kepware server
rockwellautomation1 product(s)
kepserver enterprise
softwaretoolbox1 product(s)
top server
Source: NVD CPE · 11 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://us-cert.cisa.gov/ics/advisories/icsa-20-352-02
ADVISORYhttps://us-cert.cisa.gov/ics/advisories/icsa-20-352-02

All References (2)

→
https://us-cert.cisa.gov/ics/advisories/icsa-20-352-02Third Party Advisory · US Government Resource
→
https://us-cert.cisa.gov/ics/advisories/icsa-20-352-02Third Party Advisory · US Government Resource

Quick Facts

CVE IDCVE-2020-27263
CVSS Score9.1 / 10
SeverityCRITICAL
WeaknessCWE-122
CISA KEVNo
Affected4 vendor(s)
PublishedJan 14, 2021

Related CVEs (CWE-122)

CVE-2026-46752
10.0
CVE-2025-23123
10.0
CVE-2022-34819
10.0
CVE-2021-25387
10.0
CVE-2021-21940
10.0
CVE-2026-44050
9.9

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2020-27263 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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