CVE-2016-20047

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.

Score

CVSS 4.0 8.6 High

Status

Awaiting Analysis - disclosure@vulncheck.com

Published

2026-03-28

Last modified

2026-03-30

Weaknesses

CWE-787

Affected products

• Ekg Gadu (Ekg)

References

• http://ekg.chmurka.net/
• https://www.exploit-db.com/exploits/40392
• https://www.vulncheck.com/advisories/ekg-gadu-local-buffer-overflow-via-username-parameter