CVE-2025-42944: SAP Netweaver (RMI-P4) · Deserialization of Untrusted Data
Affects SAP Netweaver (RMI-P4)Source CVE Database V5
Not known to be exploited · CVSS 10.0 Critical.
Data as of 26 Oct 2026, 12:55 UTC
- EPSS
- 2.9% chance of exploitation in 30 days – higher than 87% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:HExploitation evidence
Disclosed: evidence found.
CVE published 9 Sep 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
AI-suggested
- Immediately restrict network access to the RMI-P4 service port using firewalls or network segmentation to limit exposure to untrusted networks.
- Monitor network traffic for unusual or unexpected serialized Java object payloads targeting the RMI-P4 port.
- Apply any available SAP security advisories or patches as soon as they are released; if patches are not yet available, engage SAP support for guidance.
- Implement application-layer filtering or intrusion prevention systems capable of detecting and blocking malicious deserialization attempts.
- Conduct thorough audits of SAP NetWeaver configurations to disable unnecessary services or modules, including RMI-P4 if not required.
- Employ runtime application self-protection (RASP) or endpoint detection and response (EDR) solutions to detect anomalous process behavior indicative of exploitation.
- Maintain up-to-date backups and incident response plans to quickly recover from potential compromises.
- Educate system administrators and security teams about the vulnerability and signs of exploitation to enhance detection and response capabilities.
Description
Due to a deserialization vulnerability in SAP NetWeaver, an unauthenticated attacker could exploit the system through the RMI-P4 module by submitting malicious payload to an open port. The deserialization of such untrusted Java objects could lead to arbitrary OS command execution, posing a high impact to the application's confidentiality, integrity, and availability.