SAP has patched a critical-severity zero-day vulnerability, CVE-2025-42999, in NetWeaver server.This vulnerability was chained with CVE-2025-31324, fixed in April, and poses a risk to Fortune 500 companies.The flaw allows a privileged user to upload content that could compromise confidentiality, integrity, and availability.Several firms observed attacks exploiting the vulnerability in which web shells were dropped on vulnerable servers.