Stack-Based Buffer Overflow in JAD by Varaneckas
CVE-2016-20049

9.3CRITICAL

Key Information:

Vendor

Varaneckas

Status
Jad Java Decompiler
Vendor
CVE Published:
28 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2016-20049?

JAD versions 1.5.8e-1kali1 and earlier are exposed to a stack-based buffer overflow vulnerability, allowing attackers to exploit oversized input strings. By sending input that exceeds 8150 bytes, attackers can manipulate the stack, overwrite return addresses, and execute arbitrary shellcode within the application’s context. This vulnerability poses significant risks for systems running affected versions of JAD, highlighting the importance of updating to secure versions.

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Affected Version(s)

JAD Java Decompiler 1.5.8e-1kali1

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2016-20049 - Proof of Concept

References

https://www.exploit-db.com/exploits/42076
exploit
http://www.varaneckas.com/jad/
product
https://www.vulncheck.com/advisories/jad-8e-1kali1-stack-...
third-party-advisory

CVSS V4

Score:
9.3
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Juan Sacco <juan.sacco@kpn.com> at KPN Red Team - http://www.kpn.com
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