CVE-2016-20047 HIGH

CVE-2016-20047: EKG Gadu 1.9 Local Buffer Overflow via Username Parameter

Vendor Ekg
Product EKG Gadu
Weakness CWE-787
Published March 28, 2026
Last update March 30, 2026

CVSS base score

8.6/10
Attack vector Local
Attack complexity Low
Privileges required None
User interaction None
Confidentiality
Integrity

CVSS vector

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

What the vulnerability does

01Description

EKG Gadu 1.9~pre+r2855-3+b1 contains a local buffer overflow vulnerability in the username handling that allows local attackers to execute arbitrary code by supplying an oversized username string. Attackers can trigger the overflow in the strlcpy function by passing a crafted buffer exceeding 258 bytes to overwrite the instruction pointer and execute shellcode with user privileges.

Key dates

02Disclosure timeline

March 28, 2026 CVE published
March 30, 2026 Record updated