Intel

CVE-2026-51536

opener_project opener: Sicherheitsluecke

criticalEPSS 0.6%

Description

In OpENer 2.3.0 (commit 76b95cf) when parsing incoming CIP (Common Industrial Protocol) network packets, the length parameter is inconsistently typed across the call stack. Specifically, an upstream length calculated as an int is passed to a downstream function that expects an EipInt16 (a 16-bit signed integer). If a maliciously crafted packet with specific length fields is processed, the length parameter can overflow or be truncated into a negative value. This negative length bypasses subsequent bounds checking (due to signed/unsigned comparison issues) and is ultimately used in memory operations, leading to a Stack Buffer Overflow when reading data in DecodePaddedEPath.

Source: NVD (NIST)CVE.org (MITRE)cvelistv5

Affected products

The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.

opener_projectopener

Metrics

XIEM Effective CVSS
9.1
Source: nvd-v3
EPSS percentile
48.5 %
High — this CVE ranks above the median of all CVEs scored today (rank ≥ 36%).
KEV status
—
Show all metrics
Severity
critical
Priority score
86.44
Exploit maturity
no public PoC known
CVSS v3
9.1
EPSS score
0.6 %
Low — model estimates < 1% exploitation likelihood.
Published
2026-07-13 22:16 UTC

References & sources

Reanalysis & status changes

Chronological NVD audit events for this CVE — reanalyses, CVSS updates, CPE diffs.

  1. Initial Analysis2026-08-11 16:43 UTC· nvd@nist.gov
    • CPE Configuration: OR *cpe:2.3:a:opener_project:opener:2.3.0:*:*:*:*:*:*:*
    • Reference Type: MITRE: https://gist.github.com/MrAlaskan/e160c626a32e03e5d9eddaa732560672 Types: Third Party Advisory
    • Reference Type: MITRE: https://github.com/EIPStackGroup/OpENer/issues/563 Types: Exploit, Issue Tracking, Vendor Advisory
    • Reference Type: CISA-ADP: https://github.com/EIPStackGroup/OpENer/issues/563 Types: Exploit, Issue Tracking, Vendor Advisory

Linked advisories