Vulnerability-Lookup

GHSA-V8G9-6WQG-F384

Vulnerability from github – Published: 2026-03-28 12:30 – Updated: 2026-03-28 12:30

Details

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.

Severity ?

8.4 (High)


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

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

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JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2016-20047"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-787"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-03-28T12:16:01Z",
    "severity": "HIGH"
  },
  "details": "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.",
  "id": "GHSA-v8g9-6wqg-f384",
  "modified": "2026-03-28T12:30:29Z",
  "published": "2026-03-28T12:30:29Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2016-20047"
    },
    {
      "type": "WEB",
      "url": "https://www.exploit-db.com/exploits/40392"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/ekg-gadu-local-buffer-overflow-via-username-parameter"
    },
    {
      "type": "WEB",
      "url": "http://ekg.chmurka.net"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "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:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2016-20047 (GCVE-0-2016-20047)

Vulnerability from cvelistv5 – Published: 2026-03-28 11:58 – Updated: 2026-03-30 17:30

Title

EKG Gadu 1.9 Local Buffer Overflow via Username Parameter

Summary

Severity ?

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

8.4 (High)


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

CWE

CWE-787 - Out-of-bounds Write

Assigner

VulnCheck

References

URL

Tags

	https://www.exploit-db.com/exploits/40392	exploit
	http://ekg.chmurka.net/	product
	https://www.vulncheck.com/advisories/ekg-gadu-loc…	third-party-advisory

Impacted products

	Vendor	Product	Version
	ekg	EKG Gadu	Affected: 1:1.9~pre+r2855-3+b1

Date Public ?

2016-09-19 00:00

Credits

Juan Sacco - http://www.exploitpack.com -

Show details on NVD website

JSON

To clipboard

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  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
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                "id": "CVE-2016-20047",
                "options": [
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                  },
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                  },
                  {
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                "role": "CISA Coordinator",
                "timestamp": "2026-03-30T17:29:50.294850Z",
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      ],
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            "Recovery": "NOT_DEFINED",
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          "tags": [
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Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-V8G9-6WQG-F384

CVE-2016-20047 (GCVE-0-2016-20047)

Tags

Sightings

Nomenclature