How severe is CVE-1999-1156?

CVE-1999-1156 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-1999-1156 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-1999-1156?

CVE-1999-1156 affects Bisonware Bisonware Ftp Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-1999-1156?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-1999-1156 published?

CVE-1999-1156 was published on 1999-05-17 and last updated on 2026-06-16.

CVE-1999-1156

CVE-1999-1156 is a medium-severity vulnerability in Bisonware Bisonware Ftp Server with a CVSS 2.0 base score of 5.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 1% (66th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Bisonware Bisonware Ftp Server
Published: 1999-05-17
Last modified: 2026-06-16

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-1999-1156?: CVE-1999-1156 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-1999-1156 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-1999-1156?: CVE-1999-1156 affects Bisonware Bisonware Ftp Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-1999-1156?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-1999-1156 published?: CVE-1999-1156 was published on 1999-05-17 and last updated on 2026-06-16.

References

https://exchange.xforce.ibmcloud.com/vulnerabilities/2254

Affected products (1)

cpe:2.3:a:bisonware:bisonware_ftp_server:*:*:*:*:*:*:*:*

More vulnerabilities in Bisonware Bisonware Ftp Server

CVE-1999-1510 — High (CVSS 7.5): Buffer overflows in Bisonware FTP server prior to 4.1 allow remote attackers to cause a denial of service, and possibly…
CVE-1999-0079 — Medium (CVSS 5.0): Remote attackers can cause a denial of service in FTP by issuing multiple PASV commands, causing the server to run out…

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