CVE-2016-20047
EKG Gadu 1.9 Local Buffer Overflow via Username Parameter
- State
- Published
- Severity
- 8.6 High
- Published
- Mar 28, 2026
- Updated
- Mar 30, 2026
- Reserved
- Mar 28, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.6 High | 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 | VulnCheck |
| 3.1 | 8.4 High | CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H | VulnCheck |
Weaknesses
- CWE-787 Out-of-bounds Write
Affected Products
| Product | Versions |
|---|---|
EKG Gaduekg |
|
References
- ExploitDB-40392exploit
- Official Product Homepageproduct
- VulnCheck Advisory: EKG Gadu 1.9 Local Buffer Overflow via Username Parameterthird-party-advisory
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