CVE-2016-20047

HIGH 8.4

EKG Gadu 1.9 Local Buffer Overflow via Username Parameter

CVSS Score

8.4

EPSS Score

0.0%

EPSS Percentile

2th

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.

CWE	CWE-787
Vendor	ekg
Product	ekg gadu
Published	Mar 28, 2026
Last Updated	Mar 30, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

ekg / EKG Gadu

1:1.9~pre+r2855-3+b1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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

Credits

Juan Sacco - http://www.exploitpack.com -