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Vulnerability record · CVE-2018-20684 · published 10 January 2019

CVE-2018-20684: Winscp improper input validation vulnerability

Winscp · Winscp

In WinSCP before 5.14 beta, due to missing validation, the scp implementation would accept arbitrary files sent by the server, potentially overwriting unrelated files. This affects TSCPFileSystem::SCPSink in core/ScpFileSystem.cpp.

7.5 CVSS 3.0 High EPSS 2.8% · top 14.3% CWE-20 · Improper input validation
7.5CVSS 3.0 base score, v2 6.4
2.8%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
12References
17 Jun 2026Last modified by NVD

Description

In WinSCP before 5.14 beta, due to missing validation, the scp implementation would accept arbitrary files sent by the server, potentially overwriting unrelated files. This affects TSCPFileSystem::SCPSink in core/ScpFileSystem.cpp.

CVSS:3.0/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
http://www.securityfocus.com/bid/106526 Third Party AdvisoryVDB Entry
https://github.com/winscp/winscp/commit/49d876f2c5fc00bcedaa986a7cf6dedd6bf16f54 PatchThird Party Advisory
https://sintonen.fi/advisories/scp-client-multiple-vulnerabilities.txt MitigationThird Party Advisory
https://winscp.net/eng/docs/history Release NotesVendor Advisory
https://winscp.net/tracker/1675 PatchVendor Advisory
https://www.oracle.com/security-alerts/cpujan2020.html
http://www.securityfocus.com/bid/106526 Third Party AdvisoryVDB Entry
https://github.com/winscp/winscp/commit/49d876f2c5fc00bcedaa986a7cf6dedd6bf16f54 PatchThird Party Advisory
https://sintonen.fi/advisories/scp-client-multiple-vulnerabilities.txt MitigationThird Party Advisory
https://winscp.net/eng/docs/history Release NotesVendor Advisory
https://winscp.net/tracker/1675 PatchVendor Advisory
https://www.oracle.com/security-alerts/cpujan2020.html

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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-2018-20684), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.