PatchTheCVECVE-2019-12143: A Directory Traversal issue was discovered in SSHServerAPI.dll in Progress ipswitch WS_FTP Server 2018 before
CVE-2019-12143 is a medium-severity flaw (CVSS 5.3) affecting ws ftp server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
A Directory Traversal issue was discovered in SSHServerAPI.dll in Progress ipswitch WS_FTP Server 2018 before 8.6.1. An attacker can supply a string using special patterns via the SCP protocol to disclose WS_FTP usernames as well as filenames.
Why this priority
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 5.3 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 2.0% (top 19%) |
| CISA exploited list | No |
| Weakness | CWE-22 |
| Published | 2019-06-11 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2019-12143?
ws ftp server: upgrade to 8.6.1. Exact commands for each OS are on this page.
Is CVE-2019-12143 being exploited?
CVE-2019-12143 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2019-12143 affect?
CVE-2019-12143 affects ws ftp server. Severity is medium (CVSS 5.3). A Directory Traversal issue was discovered in SSHServerAPI.dll in Progress ipswitch WS_FTP Server 2018 before 8.6.1. An attacker can supply a string using special patterns via the SCP protocol to disclose WS_FTP usernames as well as filenam
How urgent is CVE-2019-12143?
Priority 44/100. Remotely exploitable, no login, no user action
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- CVE-2023-42659 CRITICAL 9.1 UPGRADE In WS_FTP Server versions prior to 8.7.6 and 8.8.4, an unrestricted file upload flaw has been identified
- CVE-2023-42657 CRITICAL 9.9 UPGRADE In WS_FTP Server versions prior to 8.7.4 and 8.8.2, a directory traversal vulnerability was discovered. An