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Vulnerability record · CVE-2016-20046 · published 28 March 2026

CVE-2016-20046: Out-of-bounds write vulnerability

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.

8.6 CVSS 4.0 High EPSS 0.15% · top 96.5% CWE-787 · Out-of-bounds write Deferred
8.6CVSS 4.0 base score
0.15%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
17 Jun 2026Last modified by NVD

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.

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
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

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Source: NIST National Vulnerability Database (record CVE-2016-20046), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.