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Vulnerability record · CVE-2016-20047 · published 28 March 2026

CVE-2016-20047: Out-of-bounds write vulnerability

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.

8.6 CVSS 4.0 High EPSS 0.15% · top 96.5% CWE-787 · Out-of-bounds write Awaiting Analysis
8.6CVSS 4.0 base score
0.15%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
17 Jun 2026Last modified by NVD

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.

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

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

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Source: NIST National Vulnerability Database (record CVE-2016-20047), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.