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CVE-2025-42944VulnerabilityPublished Updated

CVE-2025-42944: SAP Netweaver (RMI-P4) · Deserialization of Untrusted Data

Affects SAP Netweaver (RMI-P4)Source CVE Database V5

0

Not known to be exploited · CVSS 10.0 Critical.

Data as of 26 Oct 2026, 06:26 UTC

CVSS 3.1 base score
10.0Critical
How severe the flaw is on the 0–10 CVSS scale.
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:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 9 Sep 2025

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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 2026-10-26.

What to do

AI-suggested

1. Immediately restrict network access to the RMI-P4 service port using firewalls or network segmentation to limit exposure to untrusted networks. 2. Monitor network traffic for unusual or unexpected serialized Java object payloads targeting the RMI-P4 port. 3. 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. 4. Implement application-layer filtering or intrusion prevention systems capable of detecting and blocking malicious deserialization attempts. 5. Conduct thorough audits of SAP NetWeaver configurations to disable unnecessary services or modules, including RMI-P4 if not required. 6. Employ runtime application self-protection (RASP) or endpoint detection and response (EDR) solutions to detect anomalous process behavior indicative of exploitation. 7. Maintain up-to-date backups and incident response plans to quickly recover from potential compromises. 8. 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.

References

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