What’s Vulnerable › Vulnerabilities

CVE-2016-20047: EKG Gadu 1.9 Local Buffer Overflow via Username Parameter

• Severity: high (CVSS 8.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-03-28 · updated 2026-06-17
• Weakness: CWE-787

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.

Affected products

• EKG Gadu: 1:1.9~pre+r2855-3+b1

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

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