CVE-2026-51536
CRITICALOpENer 2.3.0 - Stack Buffer Overflow via CIP Packet Length Truncation and Signed Comparison Bypass
Title source: llmDescription
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.
References (2)
Core 2
Scores
CVSS v3
9.1
EPSS
0.0047
EPSS Percentile
38.3%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
yes
Technical Impact
total
Details
CWE
CWE-190
Status
published
Published
Jul 13, 2026
Tracked Since
Jul 14, 2026