CVE-1999-1156

BisonWare FTP Server 4.1 and earlier allows remote attackers to cause a denial of service via a malformed PORT command that contains a non-numeric character and a large number of carriage returns.

Published: 1999-05-17 Last update: 2026-04-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-1999-1156 is rated Moderate Risk (44.6/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 0.66%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-1999-1156

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-03-17 0.33% 0.66% +0.33%
2 2023-03-07 1.05% 0.33% -0.73%
3 2022-02-04 — 1.05% —

Full EPSS history (3 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-1999-1156

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-1999-1156

Affected software / configurations for CVE-1999-1156

Vendor Product Version Raw CPE
bisonware bisonware_ftp_server <= 4.1 cpe:2.3:a:bisonware:bisonware_ftp_server:*:*:*:*:*:*:*:*

References for CVE-1999-1156

cvelogic Threat Intelligence