CVE-2017-20227: Buffer Overflow in JAD Java Decompiler

The vulnerability lies in how JAD Java Decompiler handles overly long input during the decompilation process. An attacker can craft a specially designed input file that triggers a buffer overflow on the stack. This overflow can overwrite critical data, including return addresses, allowing the attacker to hijack program execution. The attacker can then execute arbitrary code, potentially gaining full control of the system running the decompiler. This is similar to other stack-based buffer overflow exploits where attackers leverage return-oriented programming (ROP) chains to achieve code execution. The blast radius extends to any system where JAD Java Decompiler is used, particularly in environments where decompiled code is analyzed or integrated into other projects.

1. Reserved2026-03-28
2. Published2026-03-28
3. Modified2026-04-01
4. EPSS updated2026-04-04

The primary mitigation is to upgrade to a patched version of JAD Java Decompiler. Unfortunately, a specific patched version is not provided in the CVE data. Until a patched version is released, consider limiting the use of JAD Java Decompiler to trusted input sources only. Implement input validation to restrict the size of files processed by the decompiler. While a WAF or proxy cannot directly mitigate this vulnerability, they can be configured to monitor for suspicious network traffic patterns associated with decompilation attempts. Monitor system logs for unusual process activity or memory access patterns that might indicate exploitation.