CVE intelligence and bounded remediation

CVE-2021-27635 — Sap Netweaver Application Server For Java security vulnerability

Critical CVSS 9

SAP NetWeaver AS for JAVA, versions - 7.20, 7.30, 7.31, 7.40, 7.50, allows an attacker authenticated as an administrator to connect over a network and submit a specially crafted XML file in the application because of missing XML Validation, this vulnerability enables attacker to fully compromise confidentiality by allowing them to read any file on the filesystem or fully compromise availability by causing the system to crash. The attack cannot be used to change any data so that there is no compromise as to integrity.

Severity
Critical
CVSS
9 (3.0)
Published
2021-06-09
CISA KEV
Not currently listed
Ecosystem
java/maven
Weaknesses
CWE-611

Affected products

  • sap / netweaver_application_server_for_java / 7.20
  • sap / netweaver_application_server_for_java / 7.30
  • sap / netweaver_application_server_for_java / 7.31
  • sap / netweaver_application_server_for_java / 7.40
  • sap / netweaver_application_server_for_java / 7.50

Matched remediation archetype

XML external entity and unsafe XML processing

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Check exposure

  • Inventory XML parsers used by APIs, file imports, office or image formats, identity protocols, feeds, and background jobs.
  • Determine whether document type declarations, external entities, XInclude, schemas, or network resolvers are enabled.
  • Map parser filesystem and network access and the sensitivity of documents it processes.

Remediate safely

  • Configure each parser to reject document type declarations and disable external entity, XInclude, and network resolution features.
  • Prefer a data format or hardened parser that does not support external resolution, and apply input size and depth limits.
  • Update affected XML libraries and centralize secure parser construction so callers cannot silently override it.

Authoritative sources

Complete CVE record and remediation plan

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