CVE-2016-20047 | EKG Gadu 11.9~pre+r2855-3+b1 strlcpy out-of-bounds write (Exploit 40392 / EDB-40392)

VDB-354101 · CVE-2016-20047 · EXPLOIT 40392 EKG GADU 11.9~PRE+R2855-3+B1 STRLCPY OUT-OF-BOUNDS WRITE HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 6.6 $0-$5k 2.59+ Summaryinfo A vulnerability classified as critical has been found in EKG Gadu 11.9~pre+r2855-3+b1. Affected by this vulnerability is the function strlcpy. The manipulation leads to out-of-bounds write. This vulnerability is documented as CVE-2016-20047. The attack needs to be performed locally. Additionally, an exploit exists. Detailsinfo A vulnerability was found in EKG Gadu 11.9~pre+r2855-3+b1 and classified as critical. This issue affects the function strlcpy. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. Using CWE to declare the problem leads to CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. Impacted is confidentiality, integrity, and availability. The summary by CVE is: 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. The advisory is shared at exploit-db.com. The identification of this vulnerability is CVE-2016-20047 since 03/28/2026. The exploitation is known to be easy. An attack has to be approached locally. Technical details as well as a public exploit are known. The exploit is available at exploit-db.com. It is declared as proof-of-concept. There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product. The vulnerability is also documented in the vulnerability database at Exploit-DB (40392). Productinfo Vendor EKG Name Gadu Version 11.9~pre+r2855-3+b1 CPE 2.3info 🔒 CPE 2.2info 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA CVSS-B Score: 🔒 CNA CVSS-BT Score: 🔒 CNA Vector: 🔒 CVSSv3info VulDB Meta Base Score: 6.8 VulDB Meta Temp Score: 6.6 VulDB Base Score: 5.3 VulDB Temp Score: 4.8 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 8.4 CNA Vector (VulnCheck): 🔒 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Out-of-bounds write CWE: CWE-787 / CWE-119 CAPEC: 🔒 ATT&CK: 🔒 Physical: Partially Local: Yes Remote: No Availability: 🔒 Access: Public Status: Proof-of-Concept Download: 🔒 EPSS Score: 🔒 EPSS Percentile: 🔒 Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Exploit-DB: 🔒 Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: no mitigation known Status: 🔍 0-Day Time: 🔒 Timelineinfo 03/28/2026 Advisory disclosed 03/28/2026 +0 days CVE reserved 03/28/2026 +0 days VulDB entry created 03/28/2026 +0 days VulDB entry last update Sourcesinfo Advisory: 40392 Status: Not defined CVE: CVE-2016-20047 (🔒) GCVE (CVE): GCVE-0-2016-20047 GCVE (VulDB): GCVE-100-354101 scip Labs: https://www.scip.ch/en/?labs.20161013 Entryinfo Created: 03/28/2026 21:57 Changes: 03/28/2026 21:57 (79) Complete: 🔍 Cache ID: 99:02E:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸