External risk intelligence

SAP NetWeaver ABAP Memory Corruption Leading to Unauthorized Access

CVE advisorySeverity: CRITICAL (CVSS 9.9)

CVE-2026-44747

This vulnerability affects SAP NetWeaver Application Server ABAP. While it is network-reachable, it typically requires authenticated access to the application server backend, which is generally not exposed directly to the public internet and is usually protected behind internal network controls or corporate access management systems.

Out-of-bounds Write

Halo Surface Signal: 2 out of 5 — less likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

SAP NetWeaver Application Server ABAP has a vulnerability that, if exploited by an authenticated user, could lead to unauthorized data access, modification, or system downtime due to memory corruption.

Flaw lets authenticated users corrupt memory.
It affects critical SAP business systems.
Confirm if your SAP NetWeaver systems are exposed.

Attack Path

How an attacker could exploit the issue

An attacker with authenticated access to SAP NetWeaver Application Server ABAP could exploit a flaw in how the system handles memory. By triggering this logical error, they could corrupt memory, potentially leading to unauthorized access to sensitive data, modification of existing information, or disruption of the application's services.

Requires authenticated access.
Logical error in memory management.
Risk of data exposure or system disruption.

Live Threat

Current exploitation, exposure, and threat context

An authenticated attacker with normal privileges could cause memory corruption in SAP NetWeaver Application Server ABAP, potentially leading to unauthorized access or modification of data, or system unavailability. This vulnerability has a high impact on confidentiality, integrity, and availability.

Sensitive user data at risk.
Tampered identity information accepted.
Unauthorized access or disruption.

Operational Fix

Recommended remediation, mitigation, and detection steps

The SAP NetWeaver Application Server ABAP vulnerability impacts confidentiality, integrity, and availability and necessitates action from teams managing SAP environments. The first practical step is to identify all instances of SAP NetWeaver Application Server ABAP, determine their exposure and business criticality, and then locate the accountable owner to plan remediation.

Own the issue by SAP Basis or Application Support.
Verify reachability and business criticality.
Plan risk-based remediation with SAP.

Supplementary metadata

CVSS vector

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Frequently asked questions

What is SAP NetWeaver Application Server ABAP?

SAP NetWeaver Application Server ABAP is the foundational platform for running SAP enterprise software. It acts as the runtime environment for business applications, handling data processing, user sessions, and communication between different SAP modules. Because it manages the core operations of critical business systems, it functions as the central engine for an organization's ERP and business data workflows.

How does memory corruption work in CVE-2026-44747?

This vulnerability is classified as CWE-787, or Out-of-bounds Write. It stems from a logical error in how the software manages memory. An attacker can exploit this flaw to write data to unintended memory locations. This manipulation can corrupt the system's normal operational logic, potentially allowing unauthorized access to sensitive information or causing the entire application to crash.

Do I need administrator access to trigger CVE-2026-44747?

No. The vulnerability requires the attacker to have authenticated access, but they do not necessarily need administrative or superuser privileges to initiate the attack. Crucially, the flaw cannot be triggered by unauthenticated users browsing the application. It relies on someone already possessing a legitimate, authenticated session within the application server.

Is my system at risk according to Halo Surface Signal?

Halo Surface Signal notes that while this vulnerability is technically reachable via the network, the SAP NetWeaver backend typically requires authentication. Since these interfaces are rarely exposed directly to the public internet and are usually protected by internal network controls or corporate access management, the immediate risk of external exploitation is considered unlikely for most well-configured environments.

When should I prioritize addressing this SAP vulnerability?

You should prioritize this based on the business criticality of the affected SAP instances. Start by identifying all running instances of SAP NetWeaver Application Server ABAP within your infrastructure. Once identified, coordinate with your SAP Basis or Application Support teams to verify reachability and plan a risk-based remediation strategy, such as applying official SAP security patches.

References

me.sap.com/notes/3747367

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.