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CVE-2021-4189 is a server-side request forgery flaw in Python's ftplib FTP client when operating in passive (PASV) mode. ftplib trusted the host address supplied by an FTP server in its PASV response. A malicious FTP server could therefore cause a vulnerable FTP client to establish a connection to an attacker-selected IP address and port, rather than restricting the data connection to the FTP server's actual peer address.
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What an attacker gets, and what they’ve been doing with it.
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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.
22 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A remotely exploitable, low-complexity vulnerability requiring no privileges or user interaction that can result in limited confidentiality impact, according to the supplied CVSS v3 vector.
Unknown; the advisory identifies it as addressed but provides no vulnerability description.
A Linux kernel vulnerability referenced by the advisory; no technical details are provided in this content.
CVE listed as addressed by this advisory; no technical description is provided in the content.
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.