{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"state":"PUBLISHED","cveId":"CVE-2021-4189","assignerOrgId":"53f830b8-0a3f-465b-8143-3b8a9948e749","assignerShortName":"redhat","dateUpdated":"2025-12-17T21:36:07.876Z","dateReserved":"2021-12-29T00:00:00.000Z","datePublished":"2022-08-24T00:00:00.000Z"},"containers":{"cna":{"providerMetadata":{"orgId":"53f830b8-0a3f-465b-8143-3b8a9948e749","shortName":"redhat","dateUpdated":"2023-06-30T00:00:00.000Z"},"descriptions":[{"lang":"en","value":"A flaw was found in Python, specifically in the FTP (File Transfer Protocol) client library in PASV (passive) mode. The issue is how the FTP client trusts the host from the PASV response by default. This flaw allows an attacker to set up a malicious FTP server that can trick FTP clients into connecting back to a given IP address and port. This vulnerability could lead to FTP client scanning ports, which otherwise would not have been possible."}],"affected":[{"vendor":"n/a","product":"python","versions":[{"version":"Fixed in python 3.6.14, python 3.7.11, python 3.8.9, python 3.9.3, python 3.10.0","status":"affected"}]}],"references":[{"url":"https://bugs.python.org/issue43285"},{"url":"https://python-security.readthedocs.io/vuln/ftplib-pasv.html"},{"url":"https://github.com/python/cpython/commit/0ab152c6b5d95caa2dc1a30fa96e10258b5f188e"},{"url":"https://security-tracker.debian.org/tracker/CVE-2021-4189"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2036020"},{"url":"https://access.redhat.com/security/cve/CVE-2021-4189"},{"url":"https://security.netapp.com/advisory/ntap-20221104-0004/"},{"name":"[debian-lts-announce] 20230524 [SECURITY] [DLA 3432-1] python2.7 security update","tags":["mailing-list"],"url":"https://lists.debian.org/debian-lts-announce/2023/05/msg00024.html"},{"name":"[debian-lts-announce] 20230630 [SECURITY] [DLA 3477-1] python3.7 security update","tags":["mailing-list"],"url":"https://lists.debian.org/debian-lts-announce/2023/06/msg00039.html"}],"problemTypes":[{"descriptions":[{"type":"text","lang":"en","description":"Not-Known"}]}]},"adp":[{"title":"CVE Program Container","references":[{"url":"https://bugs.python.org/issue43285","tags":["x_transferred"]},{"url":"https://python-security.readthedocs.io/vuln/ftplib-pasv.html","tags":["x_transferred"]},{"url":"https://github.com/python/cpython/commit/0ab152c6b5d95caa2dc1a30fa96e10258b5f188e","tags":["x_transferred"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2021-4189","tags":["x_transferred"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2036020","tags":["x_transferred"]},{"url":"https://access.redhat.com/security/cve/CVE-2021-4189","tags":["x_transferred"]},{"url":"https://security.netapp.com/advisory/ntap-20221104-0004/","tags":["x_transferred"]},{"name":"[debian-lts-announce] 20230524 [SECURITY] [DLA 3432-1] python2.7 security update","tags":["mailing-list","x_transferred"],"url":"https://lists.debian.org/debian-lts-announce/2023/05/msg00024.html"},{"name":"[debian-lts-announce] 20230630 [SECURITY] [DLA 3477-1] python3.7 security update","tags":["mailing-list","x_transferred"],"url":"https://lists.debian.org/debian-lts-announce/2023/06/msg00039.html"},{"url":"https://lists.debian.org/debian-lts-announce/2024/12/msg00000.html"}],"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2025-11-03T21:45:21.395Z"}},{"problemTypes":[{"descriptions":[{"type":"CWE","cweId":"CWE-252","lang":"en","description":"CWE-252 Unchecked Return Value"}]}],"metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":5.3,"attackVector":"NETWORK","baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"NONE","privilegesRequired":"NONE","confidentialityImpact":"LOW"}},{"other":{"type":"ssvc","content":{"timestamp":"2025-06-25T14:59:42.470722Z","id":"CVE-2021-4189","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2025-12-17T21:36:07.876Z"}}]}}