Debian Security Bug TrackerDEBIANCVE:CVE-2021-4189CVE-2021-4189
5.3 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
0.002 Low
EPSS
Percentile
55.7%
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.
| OS | Version | Architecture | Package | Version | Filename |
|---|---|---|---|---|---|
| Debian | 12 | all | pypy3 | < 7.3.8+dfsg-1 | pypy3_7.3.8+dfsg-1_all.deb |
| Debian | 11 | all | pypy3 | <= 7.3.5+dfsg-2+deb11u2 | pypy3_7.3.5+dfsg-2+deb11u2_all.deb |
| Debian | 10 | all | pypy3 | <= 7.0.0+dfsg-3 | pypy3_7.0.0+dfsg-3_all.deb |
| Debian | 999 | all | pypy3 | < 7.3.8+dfsg-1 | pypy3_7.3.8+dfsg-1_all.deb |
| Debian | 13 | all | pypy3 | < 7.3.8+dfsg-1 | pypy3_7.3.8+dfsg-1_all.deb |
| Debian | 11 | all | python2.7 | <= 2.7.18-8+deb11u1 | python2.7_2.7.18-8+deb11u1_all.deb |
| Debian | 10 | all | python2.7 | < 2.7.16-2+deb10u2 | python2.7_2.7.16-2+deb10u2_all.deb |
| Debian | 10 | all | python3.7 | < 3.7.3-2+deb10u5 | python3.7_3.7.3-2+deb10u5_all.deb |
| Debian | 11 | all | python3.9 | <= 3.9.2-1 | python3.9_3.9.2-1_all.deb |
Related
5.3 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
0.002 Low
EPSS
Percentile
55.7%