CVE-2021-27500 - CVE House
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Status published High CVE-2021-27500

EIPStackGroup OpENer Ethernet/IP Reachable Assertion

Vulnerability Description

A specifically crafted packet sent by an attacker to EIPStackGroup OpENer EtherNet/IP commits and versions prior to Feb 10, 2021 may result in a denial-of-service condition.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

  • Tal Keren and Sharon Brizinov of Claroty reported these vulnerabilities to CISA.

References

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CVE-2021-27482
EIPStackGroup OpENer Ethernet/IP Out-of-bounds Read
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CVE-2021-27478
EIPStackGroup OpENer Ethernet/IP Incorrect Conversion between Numeric Types
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Affected Vendor

EIPStackGroup

View all reports →

Affected Software

OpENer EtherNet/IP
Vulnerable Versions:
unspecified

Timeline

Official Publish: May 12th, 2022
Last Modified: April 16th, 2025
Added to House: July 21st, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weaknesses (CWE)

CWE-617

MITRE ATT&CK TTPs

T1499 Endpoint Denial of Service
Impact
T1190 Exploit Public-Facing Application
Initial Access
T1059 Command and Scripting Interpreter
Execution
T1562 Impair Defenses
Defense Evasion
T1485 Data Destruction
Impact