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CRITICAL · CVSS 9.1 CISA Known Exploited Vulnerability

CVE-2025-42999

SAP NetWeaver Deserialization Vulnerability

SAP NetWeaver

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.

CVSS
9.1
CRITICAL
EPSS
12.9%
30-day exploitation
Ransomware groups
0
recorded exploiting
Published
13 May 2025
CWE-502

Exploitation status

CISA Known Exploited Vulnerabilities

Listed by CISA on 15 May 2025. US federal agencies were required to remediate it by 5 June 2025. CISA records this vulnerability as known to be used in ransomware campaigns.

EPSS — exploitation probability

FIRST puts the probability of exploitation activity in the next 30 days at 12.9%, which is higher than 96.3% of all scored vulnerabilities. EPSS is a forecast of activity, not a measure of severity, and it is rescored daily.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Frequently asked questions

Is CVE-2025-42999 being exploited by ransomware groups?

No ransomware group in this database is currently recorded as exploiting CVE-2025-42999.

What does CVE-2025-42999 affect?

CVE-2025-42999 affects SAP NetWeaver. 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 is rated CRITICAL with a CVSS base score of 9.1. EPSS puts the probability of exploitation in the next 30 days at 12.9%, higher than 96.3% of all scored vulnerabilities. It is listed in the CISA Known Exploited Vulnerabilities catalog, with a federal remediation deadline of 5 June 2025.

How should organisations respond to CVE-2025-42999?

Apply the vendor patch for SAP NetWeaver as the first priority, and treat any internet-facing instance as the most urgent. Because this vulnerability is associated with ransomware activity, also review whether the affected systems were reachable before patching, rather than assuming that patching alone closes the incident.