CVE-2021-3331

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Summary

CVECVE-2021-3331
StatePUBLISHED
Assignermitre
Source PriorityCVE Program / NVD first with legacy fallback
Published2021-01-27 21:15:16 UTC
Updated2026-10-08 21:17:39 UTC
DescriptionWinSCP before 5.17.10 allows remote attackers to execute arbitrary programs when the URL handler encounters a crafted URL that loads session settings. (For example, this is exploitable in a default installation in which WinSCP is the handler for sftp:// URLs.)

Risk And Classification

Primary CVSS: v3.1 9.8 CRITICAL from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.076110000 probability, percentile 0.944200000 (date 2026-10-10)

Problem Types: NVD-CWE-Other | n/a

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
2.0[email protected]Primary10AV:N/AC:L/Au:N/C:C/I:C/A:C

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v2.0 Breakdown

Access Vector
Network
Access Complexity
Low
Authentication
None
Confidentiality
Complete
Integrity
Complete
Availability
Complete

AV:N/AC:L/Au:N/C:C/I:C/A:C

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Winscp Winscp All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na N/a affected n/a Not specified

References

ReferenceSourceLinkTags
WinSCP :: Documentation (History) af854a3a-2127-422b-91ae-364da2661108 winscp.net Release Notes, Vendor Advisory
Bug 1943 – Prevent loading session settings that can lead to remote code execution from handled URLs :: Tracker :: WinSCP af854a3a-2127-422b-91ae-364da2661108 winscp.net Patch, Vendor Advisory
Bug 1943: Prevent loading session settings that can lead to remote co… · winscp/winscp@faa96e8 · GitHub af854a3a-2127-422b-91ae-364da2661108 github.com Patch, Third Party Advisory
Raw Session Settings :: WinSCP af854a3a-2127-422b-91ae-364da2661108 winscp.net Vendor Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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