CVE-2016-3976
Published: November 3, 2021
Official Description
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 KEV Advisory
SAP NetWeaver Directory Traversal Vulnerability
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.
Apply updates per vendor instructions.
Risk Analysis
SAP NetWeaver Application Server Java Platforms are vulnerable to a directory traversal flaw via the CrashFileDownloadServlet, allowing remote attackers to read arbitrary files. The high EPSS score of 0.81466 indicates a very high likelihood of exploitation, and its presence in CISA's KEV catalog confirms active exploitation.
Active exploitation of this vulnerability has been observed in the wild, posing a significant risk to SAP NetWeaver installations. It is remotely exploitable.
Apply the latest security updates for SAP NetWeaver Application Server Java Platforms to mitigate this directory traversal vulnerability. Implement strict input validation for file-related operations.
Technical Analysis
CVE-2016-3976 requires local access, meaning attackers must already have a foothold on the target system.
Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
CISA has added CVE-2016-3976 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.
Affected Vendors & Products
Exploit & PoC Resources
All References (1)
Quick Facts
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2016-3976 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
- !CISA KEV: Federal agencies must patch per BOD 22-01 timeline
- !Active exploitation confirmed — treat as P1