CVE-2021-4189

Katalog CVE

CVSS 5.3 · Medium EPSS 3,2%

Kerentanan Unchecked Return Value pada python, debian linux +3 lainnya. Skor CVSS 3.1 5.3 (Medium) menurut NVD.

Deskripsi (NVD)

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.

Rincian

Terbit di NVD

24 Agustus 2022

Terakhir diubah

17 Juni 2026

Status NVD

Modified

CVSS 3.1

5.3 (Medium), sumber NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-252: Unchecked Return Value

EPSS (30 hari)

3,2% peluang dieksploitasi; lebih tinggi dari 87,8% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://bugs.python.org/issue43285 patch · advisory vendor
• https://bugzilla.redhat.com/show_bug.cgi?id=2036020 issue tracking · patch · advisory pihak ketiga
• https://github.com/python/cpython/commit/0ab152c6b5d95caa2dc1a30fa96e10258b5f188e patch · advisory pihak ketiga
• https://python-security.readthedocs.io/vuln/ftplib-pasv.html patch · advisory pihak ketiga
• https://access.redhat.com/security/cve/CVE-2021-4189 advisory pihak ketiga
• https://security-tracker.debian.org/tracker/CVE-2021-4189 advisory pihak ketiga
• https://security.netapp.com/advisory/ntap-20221104-0004/ advisory pihak ketiga
• https://lists.debian.org/debian-lts-announce/2023/05/msg00024.html
• https://lists.debian.org/debian-lts-announce/2023/06/msg00039.html
• https://lists.debian.org/debian-lts-announce/2024/12/msg00000.html