Insecure Deserialization in SAP NetWeaver Visual Composer Metadata Uploader
CVE-2025-42999 is a critical insecure deserialization vulnerability in SAP NetWeaver Visual Composer Metadata Uploader, affecting the Visual Composer development server component. The issue arises when a privileged user can upload untrusted or malicious serialized content that is subsequently deserialized by the application without sufficient validation. Public reporting and the provided context describe the flaw as enabling execution of attacker-controlled payloads via crafted serialized objects, with SAP Security Note 3604119 addressing the issue. The vulnerability has been described as affecting VCFRAMEWORK 7.50 in at least some reporting, and it was also reported as part of exploit chains involving the related Visual Composer flaw CVE-2025-31324.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
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Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
52 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A SAP NetWeaver vulnerability used in a public exploit chain to bypass authentication and achieve RCE (when chained with CVE-2025-31324).
SAP NetWeaver critical flaw used in a chained exploit with CVE-2025-31324 to bypass authentication and achieve remote code execution.
A critical vulnerability addressed by SAP Security Note 3604119, described as the underlying root cause behind CVE-2025-31324 and associated with insecure deserialization. It was added to CISA's KEV catalog, indicating exploitation in the wild.
A critical remote code execution vulnerability in SAP NetWeaver, with a high EPSS score (0.97), indicating high likelihood of exploitation.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.