CVE-2020-27263

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.

Published: 2021-01-14 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-27263 is rated Moderate Risk (48/100): CVSS Critical severity, with low exploitation likelihood (EPSS 0.13%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2020-27263

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-08-01 0.16% 0.13% -0.03%
2 2025-03-30 0.34% 0.16% -0.18%
3 2025-03-29 — 0.34% —

Full EPSS history (16 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-27263

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.1 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.2 [email protected]
6.4 2.0 MEDIUM
AV:N/AC:L/Au:N/C:P/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 4.9 [email protected]

Weakness enumeration for CVE-2020-27263

Affected software / configurations for CVE-2020-27263

Vendor Product Version Raw CPE
ge industrial_gateway_server 7.66 cpe:2.3:a:ge:industrial_gateway_server:7.66:*:*:*:*:*:*:*
ge industrial_gateway_server 7.68.804 cpe:2.3:a:ge:industrial_gateway_server:7.68.804:*:*:*:*:*:*:*
ptc kepware_kepserverex 6.0 cpe:2.3:a:ptc:kepware_kepserverex:6.0:*:*:*:*:*:*:*
ptc kepware_kepserverex 6.9 cpe:2.3:a:ptc:kepware_kepserverex:6.9:*:*:*:*:*:*:*
ptc opc-aggregator — cpe:2.3:a:ptc:opc-aggregator:-:*:*:*:*:*:*:*
ptc thingworx_industrial_connectivity — cpe:2.3:a:ptc:thingworx_industrial_connectivity:-:*:*:*:*:*:*:*
ptc thingworx_kepware_server 6.8 cpe:2.3:a:ptc:thingworx_kepware_server:6.8:*:*:*:*:*:*:*
ptc thingworx_kepware_server 6.9 cpe:2.3:a:ptc:thingworx_kepware_server:6.9:*:*:*:*:*:*:*
rockwellautomation kepserver_enterprise 6.6.504.0 cpe:2.3:a:rockwellautomation:kepserver_enterprise:6.6.504.0:*:*:*:*:*:*:*
rockwellautomation kepserver_enterprise 6.9.572.0 cpe:2.3:a:rockwellautomation:kepserver_enterprise:6.9.572.0:*:*:*:*:*:*:*
softwaretoolbox top_server >= 6.0, <= 6.9 cpe:2.3:a:softwaretoolbox:top_server:*:*:*:*:*:*:*:*

References for CVE-2020-27263

URL Tags
https://us-cert.cisa.gov/ics/advisories/icsa-20-352-02 Third Party Advisory US Government Resource
cvelogic Threat Intelligence