SAP NetWeaver Deserialization Vulnerability
SAP_SE — SAP NetWeaver (Visual Composer development server)
SAP NetWeaver Visual Composer Metadata Uploader is vulnerable when a privileged user can upload untrusted or malicious content which, when deserialized, could potentially lead to a compromise of confidentiality, integrity, and availability of the host system.
9.1
13.9%
Vector breakdown
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- High
- User interaction
- None
- Scope
- Changed
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
- Published
- May 13, 2025
- Modified
- Aug 11, 2026
- Added to KEV
- May 15, 2025
- Federal patch due
- Jun 5, 2025
CISA required action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Weakness classification
Proof-of-concept & exploitation references
Weaponization
Public repositories whose name or description references CVE-2025-42999, found via a live GitHub search at request time. These are community-sourced signals, not a verified working exploit — cross-check each one before relying on it, and treat higher star counts and recent activity as (weak) corroboration, not proof.
No public GitHub repositories referencing CVE-2025-42999 were found at last check. Absence here is not proof no exploit exists — see the references below for vendor advisories and write-ups.
References
How this class of flaw gets exploited
Frequently asked questions
What is CVE-2025-42999?
SAP NetWeaver Visual Composer Metadata Uploader is vulnerable when a privileged user can upload untrusted or malicious content which, when deserialized, could potentially lead to a compromise of confidentiality, integrity, and availability of the host system.
How severe is CVE-2025-42999?
CVE-2025-42999 has a CVSS base score of 9.1 out of 10 (CVSS 3.1).
Is CVE-2025-42999 actively exploited in the wild?
Yes. CVE-2025-42999 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added May 15, 2025, meaning CISA has confirmed evidence of active exploitation. It is also flagged as used in ransomware campaigns.
What is the EPSS score for CVE-2025-42999?
13.9% - meaning FIRST.org's EPSS model estimates a 13.9% probability this vulnerability will be exploited in the wild within 30 days (96% percentile among all scored CVEs).
What type of vulnerability is CVE-2025-42999?
CVE-2025-42999 is classified under CWE-502 (CWE-502: Deserialization of Untrusted Data).
Cross-checked against
Impactr finds and proves whether CVE-2025-42999 — or flaws like it — are actually reachable in your own web apps and APIs, with a reproducible exploit as evidence.