CVE-2016-20046

HIGH

zFTP Client 20061220+dfsg3-4.1 Local Buffer Overflow

Title source: cna
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2016-20046. PoCs published by Juan Sacco.

AI-analyzed exploit summary This exploit demonstrates a local buffer overflow in zFTP Client (version 20061220+dfsg3-4.1) by overflowing the NAME field during an FTP connection, leading to arbitrary code execution via a crafted payload with NOP sled, shellcode, and EIP overwrite.

Description

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.

Exploits (1)

exploitdb WORKING POC
by Juan Sacco · pythonlocallinux
https://www.exploit-db.com/exploits/40203

This exploit demonstrates a local buffer overflow in zFTP Client (version 20061220+dfsg3-4.1) by overflowing the NAME field during an FTP connection, leading to arbitrary code execution via a crafted payload with NOP sled, shellcode, and EIP overwrite.

Classification
Working Poc 95%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: zFTP Client 20061220+dfsg3-4.1
No auth needed
Prerequisites: Local access to the target system · zFTP Client installed
devstral-2 · analyzed Apr 08, 2026 Full analysis →

References (3)

Core 3
Core References
Exploit exploit
ExploitDB-40203
https://www.exploit-db.com/exploits/40203
Product product
Official Product Homepage
http://cernlib.web.cern.ch/cernlib/
Third Party Advisory third-party-advisory
VulnCheck Advisory: zFTP Client 20061220+dfsg3-4.1 Local Buffer Overflow
https://www.vulncheck.com/advisories/zftp-client-20061220-dfsg3-local-buffer-overflow

Scores

CVSS v3 8.4
EPSS 0.0015
EPSS Percentile 4.5%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation poc
Automatable no
Technical Impact total

Details

CWE
CWE-787
Status published
Products (1)
zFTP/zFTP Client 20061220+dfsg3-4.1
Published Mar 28, 2026
Tracked Since Mar 29, 2026