---
id: "CVE-2016-3976"
kind: "vulnerability"
aliases: ["CVE-2016-3976"]
title: "SAP NetWeaver: SAP NetWeaver Directory Traversal Vulnerability"
severity: "high"
cvss: 7.5
epss: 0.47252
exploited: true
status: "open"
category: "runtime"
products: [{"name": "SAP NetWeaver", "fixed": [], "affected": "", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["exploited", "java", "netweaver", "runtime", "sap"]
not_affected_if: ["not-java-application-server"]
published_at: "2016-04-07T23:59:10+00:00"
first_seen_at: "2026-10-23T19:11:53+00:00"
updated_at: "2026-10-23T21:57:34+00:00"
sources: [{"source": "kev", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2016-3976", "first_seen_at": "2026-10-23T19:11:53+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2016-3976", "first_seen_at": "2026-10-23T19:13:44+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2016-3976", "first_seen_at": "2026-10-23T21:57:34+00:00"}]
---

# SAP NetWeaver: SAP NetWeaver Directory Traversal Vulnerability

SAP NetWeaver Application Server Java has a directory traversal flaw in CrashFileDownloadServlet, where a ..\ sequence in the fileName parameter escapes the intended folder. A remote attacker can read arbitrary files from the server.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:SAP NetWeaver affected ? fixed ?

## Fix

Apply the SAP update per vendor instructions, as CISA's required action states; the specific SAP Security Note and fixed version are not in the sources.

## Timeline

- 2026-10-23T19:11:53+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2016-3976
- 2026-10-23T19:13:44+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2016-3976
- 2026-10-23T21:57:34+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2016-3976

## From the sources

SAP NetWeaver Application Server Java Platforms contains a directory traversal vulnerability via a ..\ (dot dot backslash) in the fileName parameter to CrashFileDownloadServlet. This allows remote attackers to read files.

CISA required action: Apply updates per vendor instructions.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_