# SAP NetWeaver: NetWeaver Deserialization Vulnerability · pwn.watch

> SAP NetWeaver Visual Composer Metadata Uploader contains a deserialization vulnerability that allows a privileged attacker to compromise the confidentiality, integrity, and availability of the host system by deserializing untrusted or malicious content. Added to CISA KEV on 2025-05-15.

Page: https://pwn.watch/i/sap-netweaver-cve-2025-42999 · generated 2026-10-22T23:52:53.443Z

## Status
- Severity: critical · status: closed · patch: patched
- Product: SAP NetWeaver
- Started: 2025-05-15 · closed: 2025-05-15
- CVEs: CVE-2025-42999
- Affected: See vendor advisory / CISA notes (versions not always listed in KEV feed)
- Fixed in: See vendor advisory linked in sources

## Follow this incident
- RSS (one item per update): https://pwn.watch/i/sap-netweaver-cve-2025-42999/feed.xml
- JSON Feed: https://pwn.watch/i/sap-netweaver-cve-2025-42999/feed.json
- Full data (timeline, sources, posts, agentBrief): https://pwn.watch/i/sap-netweaver-cve-2025-42999.json
- This file: https://pwn.watch/i/sap-netweaver-cve-2025-42999/llms.txt

## Updates (newest first)
- 2025-05-15: CISA added CVE-2025-42999 to the KEV catalog (due 2025-06-05).

## Fix brief
# Security brief: SAP NetWeaver: NetWeaver Deserialization Vulnerability

Source: https://pwn.watch/i/sap-netweaver-cve-2025-42999 · status: closed (closed May 15, 2025) · severity: critical · updated May 15, 2025

## Patch status
**PATCHED: fixed releases exist. Upgrade to a fixed version.**

## What it is
SAP NetWeaver Visual Composer Metadata Uploader contains a deserialization vulnerability that allows a privileged attacker to compromise the confidentiality, integrity, and availability of the host system by deserializing untrusted or malicious content. Added to CISA KEV on 2025-05-15.

Severity detail: CVSS 9.1 (CNA, v3.1); actively exploited (CISA KEV); known ransomware use

- Product: SAP NetWeaver
- CVE / advisory ids: CVE-2025-42999

## Affected versions
- See vendor advisory / CISA notes (versions not always listed in KEV feed)

## Check whether you're affected
No generic command applies (the product is a hosted service, appliance or desktop app). Check the installed version in its admin UI / About screen and compare with the versions above.

## Fix
Upgrade to one of these fixed versions (or later on the same branch):
- See vendor advisory linked in sources

After upgrading, re-run the checks above and redeploy/restart the affected services.

## Latest updates
- May 15, 2025: CISA added CVE-2025-42999 to the KEV catalog (due 2025-06-05).

## Advisories
- [SAP advisory: SAP NetWeaver](https://me.sap.com/notes/3604119) (SAP)
- [NVD: CVE-2025-42999](https://nvd.nist.gov/vuln/detail/CVE-2025-42999) (NVD)
- [CISA Known Exploited Vulnerabilities Catalog](https://www.cisa.gov/known-exploited-vulnerabilities-catalog) (CISA)

## Caveats
Derived from CISA KEV JSON feed catalogVersion 2026.10.21. CVSS from the CVE record (cvelistV5). Exact affected/fixed version strings are not always in the KEV record; verify against the vendor advisory URL. startedAt uses dateAdded (exploitation may have begun earlier; many entries are older CVEs newly confirmed as exploited in 2025).

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Machine-readable: https://pwn.watch/i/sap-netweaver-cve-2025-42999.json · all incidents: https://pwn.watch/incidents.json. Verify against the vendor advisory before changing production systems.