What is CVE-2026-51537?

CVE-2026-51537 is a critical-severity vulnerability in Opener Project, classified under Out-of-bounds Read. CVSS score: 9.1/10. Published 2026-07-13.

How severe is CVE-2026-51537?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Out-of-bounds Read in Opener Project

CVE-2026-51537

EIPStackGroup OpENer 2.3.0 (commit 76b95cf) has an out-of-bounds read issue in Connection Manager handling of ForwardOpen requests when processing short malformed packets. An attacker can send a valid ENIP outer frame carrying a malformed CIP ForwardOpen/LargeForwardOpen request, causing the parser to continue reading fields even when request data is insufficient. This issue is remotely triggerable via network traffic and does not require authentication.

Vulnerability class: Buffer Overflow

EPSS: 0.005 (39.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H.

Affected products

Opener_project Opener — versions 2.3.0
N/a — versions n/a

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read

References

cve@mitre.org (Exploit, Issue Tracking, Vendor Advisory)
cve@mitre.org (Third Party Advisory)

Frequently asked questions

What is CVE-2026-51537?: CVE-2026-51537 is a critical-severity vulnerability in Opener Project, classified under Out-of-bounds Read. CVSS score: 9.1/10. Published 2026-07-13.
How severe is CVE-2026-51537?: Critical severity. CVSS v3 base score is 9.1 out of 10.