Description

SAP NetWeaver Application Server ABAP allows an unauthenticated attacker to exploit logical errors in DIAG protocol parsing, resulting in memory corruption. This vulnerability could potentially disclose sensitive system information or crash the system, leading to a high impact on the confidentiality, integrity, and availability of the application.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "9.8",
  "pubDate": "2026-08-11T01:17:20.240Z",
  "pubdate": "2026-08-11T01:17:20.240Z",
  "executiveSummary": "A memory corruption vulnerability has been identified within SAP NetWeaver Application Server ABAP, specifically residing in the parsing mechanisms of the DIAG protocol. This flaw allows an unauthenticated remote attacker to interact with the vulnerable application and trigger logical parsing errors, resulting in severe memory corruption conditions. The impact of successful exploitation encompasses both confidentiality and availability, as the vulnerability can be leveraged to disclose sensitive system memory or induce a complete denial of service through application crashes. The affected product is SAP NetWeaver Application Server ABAP. Given that the attack requires no authentication or prior privileges and can be executed remotely over the network, the overall risk implication to enterprise environments is high. The attack vector relies on sending specially crafted network payloads via the DIAG protocol to induce parser state anomalies and out-of-bounds memory interactions. No complex exploitation prerequisites are mentioned beyond network reachability to the vulnerable SAP service, making timely remediation critical to preventing unauthorized information disclosure and system destabilization.",
  "technicalDetails": "The root cause of the vulnerability stems from logical errors during the parsing of the DIAG protocol within SAP NetWeaver Application Server ABAP. The DIAG (Dialog) protocol is responsible for handling communication between the SAP GUI and the SAP application server, processing complex binary data streams, formatting commands, and data buffers. Due to insufficient input validation, boundary checking, and state verification during the parsing routine, a malicious data structure or malformed sequence within the protocol stream can cause the parser to miscalculate buffer sizes or mismanage memory allocations.\nThe exploitation method involves an unauthenticated remote attacker establishing a network connection to the SAP NetWeaver Application Server ABAP service handling the DIAG protocol. The attacker transmits a crafted payload designed to exploit the logical errors in the protocol parser. As the application processes the malformed DIAG packets, the flawed parsing logic mishandles memory pointers or index offsets, leading to memory corruption. Depending on how the corrupted memory is subsequently accessed or processed by the runtime environment, the payload behavior can manifest in two primary ways: either by leaking adjacent memory contents containing sensitive system information back to the attacker, or by destabilizing the runtime process, triggering an unhandled exception and subsequent application crash.\nThe attack flow proceeds as follows: First, the unauthenticated attacker identifies the network port associated with the vulnerable SAP NetWeaver DIAG service. Second, the attacker crafts a malicious network packet utilizing the DIAG protocol specification, intentionally introducing structural anomalies or invalid length fields designed to trigger the parsing logic flaw. Third, the attacker transmits the payload to the server. Fourth, the vulnerable component parses the incoming data stream, fails to properly validate the input boundaries or logical states, and executes unsafe memory operations. Finally, the post-exploitation impact materializes either as a loss of confidentiality via information disclosure from corrupted memory spaces or a high-impact loss of availability due to a denial of service caused by system crashes."
}