CVE-2016-20047

HIGHPre-NVD 8.48.4—
EchelonGraph scoreMEDIUM confidence

Score 8.4 from GitHub Security Advisory (severity: HIGH) published 2026-03-28. a secondary CVSS source baseline 8.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
8.4EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.4Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
8.4
EG Score
8.4(medium)
EG Risk
42(Track)
EG Risk 42/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity84% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
4%
KEV
Not listed

Published

March 28, 2026

Last Modified

June 17, 2026

Advisory Details (3)

Auto-updated Aug 2, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic

EKG Gadu 1.9 Local Buffer Overflow via Username Parameter | Advisories | VulnCheck

https://www.vulncheck.com/advisories/ekg-gadu-local-buffer-overflow-via-username-parameter
generic🟡 PoC Available

EKG Gadu 1.9~pre+r2855-3+b1 - Local Buffer Overflow - Linux local Exploit

https://www.exploit-db.com/exploits/40392
generic

eksperymentalny klient gadu-gadu: informacje

http://ekg.chmurka.net/

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 3× in last 7d / 18× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-15 03:05 UTCEPSS rescore
  2. 2026-09-13 16:41 UTCEPSS rescore
  3. 2026-09-10 09:26 UTCEPSS rescore
  4. 2026-09-07 15:56 UTCEPSS rescore
  5. 2026-09-02 14:07 UTCEPSS rescore
  6. 2026-09-01 03:31 UTCEPSS rescore
  7. 2026-08-30 19:12 UTCEPSS rescore
  8. 2026-08-27 14:20 UTCEPSS rescore
  9. 2026-08-26 14:41 UTCEPSS rescore
  10. 2026-08-25 13:44 UTCEPSS rescore
  11. 2026-08-23 00:13 UTCEPSS rescore
  12. 2026-08-21 23:44 UTCEPSS rescore
  13. 2026-08-19 16:59 UTCEPSS rescore
  14. 2026-08-18 13:43 UTCEPSS rescore
  15. 2026-08-17 13:42 UTCEPSS rescore
  16. 2026-08-16 14:51 UTCEPSS rescore
  17. 2026-08-16 09:54 UTCEG score recompute
  18. 2026-08-16 09:54 UTCGHSA enrichment
  19. 2026-08-16 02:09 UTCEPSS rescore
  20. 2026-08-15 01:25 UTCEPSS rescore
  21. 2026-08-14 19:10 UTCGHSA enrichment
  22. 2026-08-14 06:13 UTCEG score recompute
  23. 2026-08-14 06:13 UTCGHSA enrichment
  24. 2026-08-12 20:32 UTCEG score recompute
  25. 2026-08-12 20:32 UTCGHSA enrichment
Show 33 more
  1. 2026-08-12 13:46 UTCEPSS rescore
  2. 2026-08-11 20:42 UTCEG score recompute
  3. 2026-08-11 20:42 UTCGHSA enrichment
  4. 2026-08-11 13:36 UTCEPSS rescore
  5. 2026-08-11 03:43 UTCEG score recompute
  6. 2026-08-11 03:43 UTCGHSA enrichment
  7. 2026-08-10 06:43 UTCGHSA enrichment
  8. 2026-08-09 18:14 UTCEG score recompute
  9. 2026-08-09 18:14 UTCGHSA enrichment
  10. 2026-08-09 13:42 UTCEPSS rescore
  11. 2026-08-09 05:47 UTCGHSA enrichment
  12. 2026-08-08 04:41 UTCEG score recompute
  13. 2026-08-08 04:41 UTCGHSA enrichment
  14. 2026-08-07 16:13 UTCGHSA enrichment
  15. 2026-08-06 18:32 UTCEG score recompute
  16. 2026-08-06 18:32 UTCGHSA enrichment
  17. 2026-08-06 13:42 UTCEPSS rescore
  18. 2026-08-06 00:43 UTCEG score recompute
  19. 2026-08-06 00:43 UTCGHSA enrichment
  20. 2026-08-05 19:12 UTCEPSS rescore
  21. 2026-08-04 15:04 UTCEPSS rescore
  22. 2026-08-04 10:32 UTCEPSS rescore
  23. 2026-08-03 23:03 UTCEG score recompute
  24. 2026-08-03 23:03 UTCGHSA enrichment
  25. 2026-08-02 15:08 UTCEG score recompute
  26. 2026-08-02 15:08 UTCGHSA enrichment
  27. 2026-08-02 02:22 UTCEPSS rescore
  28. 2026-08-01 04:11 UTCEPSS rescore
  29. 2026-07-30 16:23 UTCEPSS rescore
  30. 2026-07-30 01:26 UTCEPSS rescore
  31. 2026-07-28 15:31 UTCEPSS rescore
  32. 2026-07-27 14:19 UTCEG score recompute
  33. 2026-07-27 14:18 UTCGHSA enrichment

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2016-20047?
CVE-2016-20047 is a high vulnerability published on March 28, 2026. 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…
When was CVE-2016-20047 disclosed?
CVE-2016-20047 was first published in the National Vulnerability Database on March 28, 2026, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2016-20047 actively exploited?
CVE-2016-20047 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 95.5% of all scored CVEs.
What is the CVSS score of CVE-2016-20047?
CVE-2016-20047 has a CVSS v3 base score of 8.4 (NVD).
How do I remediate CVE-2016-20047?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2016-20047, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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