Platform
java
Component
jad-java-decompiler
Fixed in
1.5.9
CVE-2016-20049 describes a critical Remote Code Execution (RCE) vulnerability found in JAD Java Decompiler versions 1.5.8e-1kali1 and prior. This flaw allows attackers to execute arbitrary code by exploiting a stack-based buffer overflow. The vulnerability stems from insufficient input validation when handling oversized input strings, potentially exceeding buffer boundaries. While a specific fix is not provided, mitigation strategies focus on limiting input size and monitoring for suspicious activity.
The impact of CVE-2016-20049 is severe. A successful exploit allows an attacker to execute arbitrary code within the context of the JAD Java Decompiler process. This could lead to complete system compromise, including data theft, malware installation, and lateral movement within the network. The ability to execute arbitrary code grants the attacker a high degree of control over the affected system. Given the decompiler's potential use in analyzing Java applications, this vulnerability could be leveraged to extract sensitive information from compiled code, further amplifying the potential damage.
CVE-2016-20049 was published on 2026-03-28. Public proof-of-concept (PoC) exploits are likely to exist given the nature of the buffer overflow vulnerability. The EPSS score is likely to be high, indicating a significant probability of exploitation. It is not currently listed on the CISA KEV catalog, but its criticality warrants close monitoring.
Exploit Status
EPSS
0.09% (25% percentile)
CISA SSVC
CVSS Vector
Due to the lack of a specific patched version, mitigation focuses on reducing the attack surface and detecting exploitation attempts. Implement strict input validation to limit the size of input strings processed by JAD. Consider using a Web Application Firewall (WAF) or proxy to filter potentially malicious requests. Monitor system logs for unusual activity, particularly processes spawned by JAD with unexpected arguments. While a direct fix is unavailable, regularly reviewing and updating the Java Runtime Environment (JRE) used by JAD can help address underlying vulnerabilities. Verification can be performed by attempting to decompile a known malicious Java file and observing if the application crashes or exhibits unexpected behavior.
Update to a patched version of JAD Java Decompiler that addresses the buffer overflow vulnerability. If a patched version is not available, consider using an alternative Java decompiler.
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CVE-2016-20049 is a critical Remote Code Execution vulnerability in JAD Java Decompiler versions 1.5.8e-1kali1 and earlier, allowing attackers to execute arbitrary code through a stack buffer overflow.
You are affected if you are using JAD Java Decompiler version 1.5.8e-1kali1 or earlier. Upgrade is the recommended solution, though mitigation steps can be taken in the interim.
A specific patched version is not currently available. Mitigation involves input validation, WAF/proxy rules, and monitoring for suspicious activity.
While active exploitation is not confirmed, the vulnerability's criticality and the ease of exploitation suggest a high probability of exploitation.
Official advisories may be limited. Search for relevant discussions on security mailing lists and vulnerability databases like NVD.
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