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
12.5%
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
- Feb 26, 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
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.
What is the EPSS score for CVE-2025-42999?
12.5% - meaning FIRST.org's EPSS model estimates a 12.5% 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.
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