Loading vulnerability…
CVE-2021-3331 is an arbitrary program execution vulnerability in WinSCP before 5.17.10. The flaw resides in the application's URL handler logic, which accepted crafted handled URLs and allowed them to load session settings. By supplying attacker-controlled session parameters through a crafted URL, an attacker could set dangerous raw session options, including a local proxy method and an associated command, causing WinSCP to execute that command when the link was opened. In default configurations where WinSCP is registered as a handler for supported URI schemes such as sftp, successful exploitation can be triggered remotely via a malicious link and results in immediate program execution on the victim system.
Mallory correlates every CVE against your assets, your vendors, and active adversary campaigns. Know which vulnerabilities matter for you, not just which ones are loud.
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical vulnerability in WinSCP referenced as background context; it is mentioned because Teams allows the ftps:// URI scheme, which could trigger the WinSCP issue if present.
A remote code execution vulnerability in WinSCP URI handling where crafted URLs could load dangerous session settings and execute commands immediately.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.