HIGH 7.4 Microsoft

CVE-2021-20322

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.

Microsoft Security Update 2022-Feb: 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.

Affected Products

References

Published: 2022-02-08 · Source: Microsoft · Feed updated: 2026-09-07
This high severity vulnerability with a CVSS score of 7.4 was published on 2022-02-08 via Microsoft. EPSS score: 6.9% (top 6% of all CVEs by exploitation probability). Affected: cm1 kernel 5.10.102.1-1 on CBL Mariner 1.0.
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