CVE-1999-1539

Exp

Buffer overflow in FTP server in QPC Software's QVT/Term Plus versions 4.2d and 4.3 and QVT/Net 4.3 allows remote attackers to cause a denial of service, and possibly execute arbitrary commands, via a long (1) user name or (2) password.

Published: 1999-11-10 Last update: 2026-04-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-1999-1539 is rated High Exploit Risk (82.6/100): CVSS High severity, with high exploitation likelihood (EPSS 19.35%, 95th percentile). 2 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +4.24% over the last day, indicating growing attacker interest. Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

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

Public exploit references (Exploit-DB) for CVE-1999-1539

EDB-ID Source Kind Published Link
19619 exploit_db edb 1999-11-10 Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-1999-1539

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 2026-04-20 15.11% 19.35% +4.24%
2 2025-03-30 18.87% 15.11% -3.76%
3 2025-03-29 — 18.87% —

Full EPSS history (8 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-1999-1539

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 2.0 HIGH
AV:N/AC:L/Au:N/C:P/I:P/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:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 6.4 [email protected]

Weakness enumeration for CVE-1999-1539

Affected software / configurations for CVE-1999-1539

Vendor Product Version Raw CPE
qpc_software qvt_net 4.3 cpe:2.3:a:qpc_software:qvt_net:4.3:*:*:*:*:*:*:*
qpc_software qvt_term_plus 4.2d cpe:2.3:a:qpc_software:qvt_term_plus:4.2d:*:*:*:*:*:*:*
qpc_software qvt_term_plus 4.3 cpe:2.3:a:qpc_software:qvt_term_plus:4.3:*:*:*:*:*:*:*

References for CVE-1999-1539

cvelogic Threat Intelligence