CVE-2026-76988 in CIPster
Summary
by MITRE • 08/20/2026
A weakness has been identified in liftoff-sr CIPster 1802525be27d33e19a9a83c163e331a1d13b1892. This affects the function CipConnMgrClass::forward_open of the file cipconnectionmanager.cc of the component ForwardOpen Handler. Executing a manipulation of the argument product_code_ can lead to out-of-bounds read. It is possible to launch the attack remotely. The exploit has been made available to the public and could be used for attacks. This patch is called ea870a274bf68dfaa3f511f20e2fff6778fb7b74. A patch should be applied to remediate this issue.
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Analysis
by VulDB Data Team • 08/20/2026
The identified vulnerability resides within the liftoff-sr CIPster component, specifically affecting the ForwardOpen Handler functionality implemented in the cipconnectionmanager.cc file. The core technical flaw is located in the CipConnMgrClass::forward_open function, where improper validation of input arguments allows for an out-of-bounds read condition. This type of memory safety error typically occurs when a program reads data from a memory location that lies outside the intended buffer boundaries, often due to missing or incorrect bounds checking on user-supplied inputs. In this specific instance, manipulation of the product_code_ argument enables an attacker to trigger this invalid memory access pattern. Out-of-bounds read vulnerabilities are particularly dangerous because they can lead to information disclosure, allowing attackers to leak sensitive data from the process memory space, such as cryptographic keys or internal system states, which may facilitate further exploitation stages.
From a threat modeling perspective, this vulnerability is classified under CWE-125, which defines out-of-bounds read errors. The ability to launch attacks remotely significantly elevates the severity of this issue, placing it within the context of remote code execution or information leakage vectors often associated with ATT&CK technique T1046, Network Service Discovery, if used for reconnaissance, or more critically T1537, Transfer Data to Cloud Account, if data exfiltration is achieved. The fact that an exploit has been made publicly available indicates a high risk of active exploitation in the wild. Attackers can leverage this public proof-of-concept to target unpatched systems without needing to develop custom tooling, thereby increasing the likelihood and speed of compromise across affected deployments.
The operational impact of this vulnerability extends beyond simple data leakage. Depending on how the out-of-bounds read interacts with subsequent program logic or memory management structures, it could potentially lead to denial of service conditions through application crashes or segmentation faults. In more complex scenarios involving specific compiler optimizations or runtime environments, such memory errors can sometimes be chained with other vulnerabilities to achieve arbitrary code execution, although the primary reported impact here is the read operation itself. The presence of a public exploit means that defensive measures must prioritize immediate remediation over theoretical risk assessment. Organizations relying on liftoff-sr CIPster for industrial control system communications or similar critical infrastructure functions face heightened exposure to espionage and disruption activities if this flaw remains unaddressed.
To mitigate this vulnerability, the recommended course of action is the immediate application of patch ea870a274bf68dfaa3f511f20e2fff6778fb7b74. This update addresses the root cause by implementing proper bounds checking and input validation for the product_code_ argument within the forward_open function. Beyond applying the software patch, organizations should implement network-level controls to restrict access to the affected service endpoints, ensuring that only authorized IP ranges can initiate ForwardOpen connections. Additionally, deploying intrusion detection systems with signatures capable of identifying malformed CIP packets or anomalous memory access patterns can provide an additional layer of defense against exploitation attempts while patches are being deployed across the infrastructure. Regular vulnerability scanning and continuous monitoring for indicators of compromise related to this specific CVE will help detect any potential breaches resulting from delayed patching efforts.