How severe is CVE-1999-1568?

CVE-1999-1568 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-1999-1568 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-1999-1568?

CVE-1999-1568 affects Ncftp Ncftpd Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-1999-1568?

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-1999-1568 published?

CVE-1999-1568 was published on 1999-01-01 and last updated on 2026-06-16.

CVE-1999-1568

CVE-1999-1568 is a high-severity vulnerability in Ncftp Ncftpd Server with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-193.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 2% (82nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-193
Affected product: Ncftp Ncftpd Server
Published: 1999-01-01
Last modified: 2026-06-16

Description

Off-by-one error in NcFTPd FTP server before 2.4.1 allows a remote attacker to cause a denial of service (crash) via a long PORT command.

Frequently asked questions

What is CVE-1999-1568?: Off-by-one error in NcFTPd FTP server before 2.4.1 allows a remote attacker to cause a denial of service (crash) via a long PORT command.
How severe is CVE-1999-1568?: CVE-1999-1568 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-1999-1568 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-1999-1568?: CVE-1999-1568 affects Ncftp Ncftpd Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-1999-1568?: 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-1999-1568 published?: CVE-1999-1568 was published on 1999-01-01 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:ncftp:ncftpd_server:*:*:*:*:*:*:*:*

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