Vulnerability details
CVE-2016-20047
ekg Gadu
EKG Gadu 1.9 Local Buffer Overflow via Username Parameter
CVSS 4.0
8.6High
Official 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 scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 8.6High | 4.0 | CVEProject cvelistV5 (CNA) (VulnCheck) | 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 |
| 8.4High | 3.1 | CVEProject cvelistV5 (CNA) (VulnCheck) | CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| ekg | EKG Gadu | 1:1.9~pre+r2855-3+b1 | CVEProject cvelistV5 (CNA) |
References and advisories
3- https://www.exploit-db.com/exploits/40392 exploit
- http://ekg.chmurka.net/ product
- https://www.vulncheck.com/advisories/ekg-gadu-local-buffer-overflow-via-username-parameter third-party-advisory
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Details
- Published
- 2026-03-28
- Last updated
- 2026-03-30
- State
- Published
- Assigner (CNA)
- VulnCheck
Exploit prediction (EPSS)
0.15%
Probability of exploitation in 30 days
4.4%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- Proof of concept
- Technical impact
- Total
Weaknesses (CWE)
- CWE-787Out-of-bounds Write