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Vulnerability record · CVE-2019-19271 · published 26 November 2019

CVE-2019-19271: Proftpd improper certificate validation vulnerability

PProftpd · Proftpd

An issue was discovered in tls_verify_crl in ProFTPD before 1.3.6. A wrong iteration variable, used when checking a client certificate against CRL entries (installed by a system administrator), can cause some CRL entries to be ignored, and can allow clients whose certificates have been revoked to proceed with a connection to the server.

7.5 CVSS 3.1 High EPSS 1.1% · top 35.1% CWE-295 · Improper certificate validation
7.5CVSS 3.1 base score, v2 5.0
1.1%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

An issue was discovered in tls_verify_crl in ProFTPD before 1.3.6. A wrong iteration variable, used when checking a client certificate against CRL entries (installed by a system administrator), can cause some CRL entries to be ignored, and can allow clients whose certificates have been revoked to proceed with a connection to the server.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/proftpd/proftpd/issues/860 PatchThird Party Advisory
https://github.com/proftpd/proftpd/issues/860 PatchThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2019-19271), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.