What’s Vulnerable › Vulnerabilities

CVE-2026-51540

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-07-13 · updated 2026-08-11
• Weakness: CWE-191

Description

OpENer 2.3.0 (master branch up to commit 76b95cf) is vulnerable to a severe memory corruption issue caused by an integer underflow in the processing of connected explicit messages (SendUnitData).

Affected products

• EIPStackGroup OpENer EtherNet/IP: 2.3.0

References

• https://gist.github.com/MrAlaskan/5e0c2af7f4a1d188814c7fa8f812c8da
• https://github.com/EIPStackGroup/OpENer/issues/568
• https://github.com/EIPStackGroup/OpENer/issues/568

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