CVE-2016-20046 — zFTP Client 20061220+dfsg3-4.1 Local Buffer Overflow

Back Back to CVE browser

HIGH

zFTP Client 20061220+dfsg3-4.1 Local Buffer Overflow

Published Mar 28, 2026

8.6

HIGH

CVSS 4.0

EPSS 0.15%

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.

Affected products

Vendor zFTP Product zFTP Client Default
n/a
- Version
  20061220+dfsg3-4.1
  Status
  affected
  Constraints
  -

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

zFTP

zFTP Client

n/a

Version	Status	Constraints
20061220+dfsg3-4.1	affected	-

Remediation

No remediation recorded yet.

Metrics

0.15% 0.00150

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.

EPSS probability 0.00150

Score over time

Mar–Oct 2026

EPSS v4
EPSS v5

Percentile over time

EPSS v4
EPSS v5

Table of values (3 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 1, 2026	0.15% (0.00150)	3.54th	v5 (v2026.06.15)
Jun 15, 2026	0.15% (0.00150)	4.50th	v5 (v2026.06.15)
Mar 28, 2026	0.01% (0.00013)	2.15th	v4 (v2025.03.14)

Weaknesses (1)

CWE-787

Out-of-bounds Write

References (3)

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

Link	Providers	Tags
http://cernlib.web.cern.ch/cernlib/		product
https://www.exploit-db.com/exploits/40203		exploit
https://www.vulncheck.com/advisories/zftp-client-20061220-dfsg3-local-buffer-overflow		third-party-advisory