CVE-2016-20047: Ekg Gadu

High severity, CVSS 8.4. EPSS: 0.2% chance of exploitation in the next 30 days.

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.

Affected products

• Ekg Ekg Gadu: version 1:1.9~pre+r2855-3+b1 only

Published 2026-03-28. Last modified 2026-06-17.