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TI-2016-09223 Aliases CVE-2016-20047GHSA-v8g9-6wqg-f384

EKG Gadu 1.9 Local Buffer Overflow via Username Parameter

Priority HIGH 72CWE-787Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-787 and the CVSS impact.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00152 4th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
ekgEKG Gadu1:1.9~pre+r2855-3+b1—No fix listedCNA
  • EKG Gadu Vendorekg Affected 1:1.9~pre+r2855-3+b1 Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2016-20047
  2. 2026-10-03 Alias added: GHSA-v8g9-6wqg-f384

References

Exploit 1

Other 1

  • TI-2005-01756 A certain contributed script for ekg Gadu Gadu client 1.5 and earlier allows attackers to… CVSS 2.0HIGH 10.0
  • TI-2005-01755 Certain contributed scripts for ekg Gadu Gadu client 1.5 and earlier create temporary… CVSS 2.0HIGH 10.0
  • TI-2005-01757 Multiple integer overflows in libgadu, as used in Kopete in KDE 3.2.3 to 3.4.1, ekg… CVSS 2.0HIGH 7.5
  • TI-2005-02241 Multiple integer signedness errors in libgadu, as used in ekg before 1.6rc2 and other… CVSS 2.0HIGH 7.5
  • TI-2007-01605 Memory leak in the token OCR functionality in ekg before 1:1.7~rc2-1etch1 on Debian… CVSS 2.0MEDIUM 5.0
  • TI-2007-01604 ekg before 1:1.7~rc2-1etch1 on Debian GNU/Linux Etch allows remote attackers to cause a… CVSS 2.0MEDIUM 5.0
See all 9 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences