CVE-2018-20684

In WinSCP before 5.14 beta, due to missing validation, the scp implementation would accept...

7.5 High

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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: High
Availability: None

Exploit likelihood

2.77%Up 1.3 points since Apr 14, 2021

What each source reports

NVD Score used 7.5

Record: CVE-2018-20684
CVSS 3.0: 7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CVSS 2.0: 6.4 MediumAV:N/AC:L/Au:N/C:N/I:P/A:P
Weakness: CWE-20
Updated: 2026-11-02

CVE List No score

Record: CVE-2018-20684
Updated: 2026-11-02

EUVDEUVD-2018-13231 No score

Record: EUVD-2018-13231
Updated: 2026-11-03

GitHub AdvisoriesGHSA-j599-p537-9c5p 7.5

In WinSCP before 5.14 beta, due to missing validation, the scp implementation would accept...

Record: GHSA-j599-p537-9c5p
CVSS 3.0: 7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Weakness: CWE-20
Updated: 2026-11-02

OSV 7.5

Record: CVE-2018-20684
CVSS 3.0: 7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Updated: 2026-11-02

Affected products

winscp

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2018-20684 is a high vulnerability (CVSS 7.5) in Winscp, published January 10, 2019. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.77%, the 86th percentile. No source names a fixed version.