CVE-2016-20047

HIGH

8.4

Description

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.

CVE Details

CVSS v3.1 Score8.4

SeverityHIGH

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

Attack VectorLOCAL

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published3/28/2026

Last Modified3/30/2026

Sourcenvd

Honeypot Sightings0

Weaknesses (CWE)

CWE-787

References

http://ekg.chmurka.net/(disclosure@vulncheck.com)

https://www.exploit-db.com/exploits/40392(disclosure@vulncheck.com)

https://www.vulncheck.com/advisories/ekg-gadu-local-buffer-overflow-via-username-parameter(disclosure@vulncheck.com)

IOC Correlations

No correlations recorded

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