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CVE-2021-20322

Public on 2022-02-04
Modified on 2022-04-04
Description

A flaw in the processing of received ICMP errors (ICMP fragment needed and ICMP redirect) in the Linux kernel functionality was found to allow the ability to quickly scan open UDP ports. This flaw allows an off-path remote user to effectively bypass the source port UDP randomization. The highest threat from this vulnerability is to confidentiality and possibly integrity, because software that relies on UDP source port randomization are indirectly affected as well.

Severity
Medium
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CVSS v3 Base Score
7.4
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Affected Packages

Platform Package Release Date Advisory
Amazon Linux 1 kernel 2023-02-17 00:02 ALAS-2023-1688
Amazon Linux 1 kernel 2022-02-04 23:24 ALAS-2022-1563
Amazon Linux 2 - Kernel-5.10 Extra kernel 2022-01-20 23:51 ALAS2KERNEL-5.10-2022-006
Amazon Linux 2 - Kernel-5.4 Extra kernel 2024-06-19 20:39 ALAS2KERNEL-5.4-2024-073
Amazon Linux 2 - Kernel-5.4 Extra kernel 2022-01-20 19:10 ALAS2KERNEL-5.4-2022-009

CVSS Scores

Score Type Score Vector
Amazon Linux CVSSv3 7.4 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
NVD CVSSv2 5.8 AV:N/AC:M/Au:N/C:P/I:P/A:N
NVD CVSSv3 7.4 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N