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CVE-2018-20684

26
FAUCET Score

CVE-2018-20684 describes a critical vulnerability in WinSCP versions prior to 5.14 beta, where the SCP implementation lacked proper validation, allowing a malicious server to overwrite arbitrary files on the client system. This high-severity flaw (CVSS 7.5) has a low attack complexity and requires no user interaction, posing a significant integrity risk. While no public exploits, Metasploit modules, or Nuclei templates are currently available, and there is minimal community discussion or media coverage, the potential for unauthorized file modification remains.

Impacted Technologies

VendorProductVersion(s)CPE
<= 5.13.7CPE matchmatch criteria
cpe:2.3:a:winscp:winscp:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.5HIGH

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
2.77%
Probability of exploitation in next 30 days
EPSS Percentile
84.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0277 is in the 73rd percentile among its peer group of 51,506 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

github_advisorypatch availablevia nvd_reference
View patch

References

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