Local Buffer Overflow in EKG Gadu by EKG
CVE-2016-20047

8.6HIGH

Key Information:

Vendor

Ekg

Status
Ekg Gadu
Vendor
CVE Published:
28 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2016-20047?

EKG Gadu 1.9~pre+r2855-3+b1 exhibits a local buffer overflow vulnerability during the handling of usernames, allowing local attackers to execute arbitrary code. By supplying an oversized username string, attackers can exploit the vulnerability in the strlcpy function, potentially overwriting the instruction pointer. This flaw can lead to elevated privileges, enabling unauthorized command execution with user permissions.

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Affected Version(s)

EKG Gadu 1:1.9~pre+r2855-3+b1

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-2016-20047 - Proof of Concept

References

https://www.exploit-db.com/exploits/40392
exploit
http://ekg.chmurka.net/
product
https://www.vulncheck.com/advisories/ekg-gadu-local-buffe...
third-party-advisory

CVSS V4

Score:
8.6
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
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 - http://www.exploitpack.com -
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