How severe is CVE-1999-1539?

CVE-1999-1539 has a CVSS 2.0 base score of 7.5, rated high severity.

Is CVE-1999-1539 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 12% (96th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-1999-1539?

CVE-1999-1539 primarily affects Qpc Software Qvt Net. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-1999-1539?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-1999-1539 published?

CVE-1999-1539 was published on 1999-11-10 and last updated on 2026-06-16.

CVE-1999-1539

CVE-1999-1539 is a high-severity vulnerability in Qpc Software Qvt Net with a CVSS 2.0 base score of 7.5. Its EPSS exploit-prediction score of 12% places it in the 96th percentile, indicating an elevated likelihood of exploitation.

Key facts

Severity: High (CVSS 2.0 base score 7.5)
EPSS exploit prediction: 12% (96th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Qpc Software Qvt Net
Published: 1999-11-10
Last modified: 2026-06-16

Description

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.

Frequently asked questions

What is CVE-1999-1539?: 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.
How severe is CVE-1999-1539?: CVE-1999-1539 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-1999-1539 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 12% (96th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-1999-1539?: CVE-1999-1539 primarily affects Qpc Software Qvt Net. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-1999-1539?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-1999-1539 published?: CVE-1999-1539 was published on 1999-11-10 and last updated on 2026-06-16.

References

Affected products (3)

cpe:2.3:a:qpc_software:qvt_net:4.3:*:*:*:*:*:*:*
cpe:2.3:a:qpc_software:qvt_term_plus:4.2d:*:*:*:*:*:*:*
cpe:2.3:a:qpc_software:qvt_term_plus:4.3:*:*:*:*:*:*:*

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CVE-2001-0443 — High (CVSS 7.5): Buffer overflow in QPC QVT/Net Popd 4.20 in QVT/Net 5.0 allows remote attackers to cause a denial of service, and…
CVE-2001-0680 — Medium (CVSS 5.0): Directory traversal vulnerability in ftpd in QPC QVT/Net 4.0 and AVT/Term 5.0 allows a remote attacker to traverse…
CVE-2001-0681 — Medium (CVSS 5.0): Buffer overflow in ftpd in QPC QVT/Net 5.0 and QVT/Term 5.0 allows a remote attacker to cause a denial of service via a…

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