#VU30580 Improper Certificate Validation

Published: 2019-11-26 | Updated: 2020-09-07

Vulnerability identifier: #VU30580

Vulnerability risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-19271


Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Server applications / File servers (FTP/HTTP)

Vendor: ProFTPD


The vulnerability allows a remote non-authenticated attacker to manipulate data.

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by a system administrator), can cause some CRL entries to be ignored, and can allow clients whose certificates have been revoked to proceed with a connection to the server.

Install update from vendor's website.

Vulnerable software versions

ProFTPD: 1.3.0 - 1.3.5e


External links

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

Latest bulletins with this vulnerability