What’s Vulnerable › Vulnerabilities

CVE-2021-27478: EIPStackGroup OpENer Ethernet/IP Incorrect Conversion between Numeric Types

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-05-12 · updated 2026-06-17
• Weakness: CWE-681

Description

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

Affected products

• EIPStackGroup OpENer EtherNet/IP: through 2.3

References

• https://github.com/EIPStackGroup/OpENer
• https://www.cisa.gov/uscert/ics/advisories/icsa-21-105-02
• https://github.com/EIPStackGroup/OpENer
• https://www.cisa.gov/uscert/ics/advisories/icsa-21-105-02

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