CVE-2016-20046 | zFTP Client 20061220+dfsg3-4.1 strcpy_chk Name out-of-bounds write (Exploit 40203 / EDB-40203)

VDB-354097 · CVE-2016-20046 · EXPLOIT 40203 ZFTP CLIENT 20061220+DFSG3-4.1 STRCPY_CHK NAME OUT-OF-BOUNDS WRITE HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 6.6 $0-$5k 2.45+ Summaryinfo A vulnerability identified as critical has been detected in zFTP Client 20061220+dfsg3-4.1. The impacted element is the function strcpy_chk. This manipulation of the argument Name causes out-of-bounds write. This vulnerability is tracked as CVE-2016-20046. The attack is restricted to local execution. Moreover, an exploit is present. Detailsinfo A vulnerability classified as critical was found in zFTP Client 20061220+dfsg3-4.1. Affected by this vulnerability is the function strcpy_chk. The manipulation of the argument NAME with an unknown input leads to a out-of-bounds write vulnerability. The CWE definition for the vulnerability is CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is: zFTP Client 20061220+dfsg3-4.1 contains a buffer overflow vulnerability in the NAME parameter handling of FTP connections that allows local attackers to crash the application or execute arbitrary code. Attackers can supply an oversized NAME value exceeding the 80-byte buffer allocated in strcpy_chk to overwrite the instruction pointer and execute shellcode with user privileges. The advisory is shared at exploit-db.com. This vulnerability is known as CVE-2016-20046 since 03/28/2026. The exploitation appears to be easy. An attack has to be approached locally. Technical details and also a public exploit are known. It is possible to download the exploit 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 (40203). Productinfo Vendor zFTP Name Client Version 20061220+dfsg3-4.1 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: 40203 Status: Not defined CVE: CVE-2016-20046 (🔒) GCVE (CVE): GCVE-0-2016-20046 GCVE (VulDB): GCVE-100-354097 scip Labs: https://www.scip.ch/en/?labs.20161013 Entryinfo Created: 03/28/2026 21:55 Changes: 03/28/2026 21:55 (80) Complete: 🔍 Cache ID: 99:E4C:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸