CVE-2016-20046

zFTP Client 20061220+dfsg3-4.1 Local Buffer Overflow

CVSS 8.6 HIGHEPSS 0.1%CWE-787

Vexday Risk Score

41Attention

SSVC decision (CISA)

Attend

PoC available → attend closely

Exploit maturity

Proof of concept

Public proof of concept exists, but not yet automated.

CVSS 8.6EPSS 0.1%KEV nãoPoC públicaNuclei —Metasploit —Patch —

Lifecycle

28 Mar 2026Published on NVD

Recommendation: Plan a near-term fix — a public PoC already exists.

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.

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Affected products

zFTP · zFTP Client

public PoCs found — 1

cve_referencewww.exploit-db.com/exploits/40203unverified

⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.

References

http://cernlib.web.cern.ch/cernlib/https://www.exploit-db.com/exploits/40203 https://www.vulncheck.com/advisories/zftp-client-20061220-dfsg3-local-buffer-overflow