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 allows a privileged user to upload untrusted or malicious serialized content that is subsequently deserialized by the application. Processing crafted serialized objects can lead to arbitrary command or code execution on the underlying host. Reporting in the provided content consistently places the flaw in the Visual Composer Metadata Uploader / development server context and notes that it has been observed both as a standalone issue and chained with CVE-2025-31324 during real-world attacks.
Are you exposed to this one?
Mallory correlates every CVE against your assets, your vendors, and active adversary campaigns. Know which vulnerabilities matter for you, not just which ones are loud.
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
If you can’t patch tonight, do this now.
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
47 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 remote code execution vulnerability in SAP NetWeaver, with a high EPSS score (0.97), indicating high likelihood of exploitation.
A critical deserialization vulnerability in SAP NetWeaver that enables attackers to gain full system control, posing a severe risk to enterprise environments.
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.