CVE-2021-20322 (GCVE-0-2021-20322)

Vulnerability from cvelistv5 – Published: 2022-02-18 17:50 – Updated: 2026-07-30 15:52
VLAI
Summary
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
7.4 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
CWE
Assigner
References
Impacted products
Vendor Product Version
n/a kernel Affected: 4.15 , < 4.19.215 (custom)
Affected: 4.20 , < 5.4.146 (custom)
Affected: 5.5 , < 5.10.65 (custom)
Affected: 5.11 , < 5.13.17 (custom)
Affected: 5.14 , < 5.14.4 (custom)
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-30T16:34:14+00:00",
      "cve": "CVE-2021-20322",
      "id": "CVE-2021-20322",
      "initial_release_date": "2021-08-26T08:00:00+00:00",
      "product_status:fixed": "300",
      "product_status:known_affected": "43",
      "product_status:known_not_affected": "106",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: new DNS Cache Poisoning Attack based on ICMP fragment needed packets replies",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-20322.json",
      "version": "3"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.