CVE intelligence and bounded remediation

CVE-2020-26829 — Sap Netweaver Application Server Java security vulnerability

Critical CVSS 10

SAP NetWeaver AS JAVA (P2P Cluster Communication), versions - 7.11, 7.20, 7.30, 7.31, 7.40, 7.50, allows arbitrary connections from processes because of missing authentication check, that are outside the cluster and even outside the network segment dedicated for the internal cluster communication. As result, an unauthenticated attacker can invoke certain functions that would otherwise be restricted to system administrators only, including access to system administration functions or shutting down the system completely.

Severity
Critical
CVSS
10 (3.1)
Published
2020-12-09
CISA KEV
Not currently listed
Ecosystem
java/maven
Weaknesses
CWE-306

Affected products

  • sap / netweaver_application_server_java / 7.11
  • sap / netweaver_application_server_java / 7.20
  • sap / netweaver_application_server_java / 7.30
  • sap / netweaver_application_server_java / 7.31
  • sap / netweaver_application_server_java / 7.40
  • sap / netweaver_application_server_java / 7.50

Matched remediation archetype

Authentication bypass and missing authentication

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Check exposure

  • Map every affected endpoint and protocol path, including alternate ports, legacy routes, recovery flows, service accounts, and machine-to-machine access.
  • Confirm which deployments enable the affected authentication mode and whether the interface is reachable from untrusted networks.
  • Review session, token, credential, and proxy trust configuration without attempting account takeover.

Remediate safely

  • Apply the supported fix and centralize fail-closed authentication before protected request handling.
  • Remove default or embedded credentials, rotate affected secrets and sessions, and bind authentication decisions to the intended audience and channel.
  • Add negative tests for alternate routes, malformed or absent credentials, recovery flows, and proxy-derived identity.

Authoritative sources

Complete CVE record and remediation plan

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