boxscore/security
CVE · referencelatest edition

Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2021-20322HIGH
n/a kernel — A flaw in the processing of received ICMP errors (ICMP fragment needed and ICMP redirect) in the Linux kernel functionality was found to …
  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   H   N   N  U  H  H  N    7.4   .0685   93.5     —
AFFECTED
  Product  Versions  Fixed
  kernel   4.15 –    —
TIMELINE
  Dec 17  Reserved by redhat
  Feb 18  Published (CNA: redhat)
  Jul 30  ENRICHED — CVE-2021-20322 (kernel). Received CVSS 7.4 and CPE data from NVD.
CWE-330 · CNA: redhat · CVSS v3.1 · 9 references · NVD status: Analyzed

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.

Lifecycle

Complete event history — 3 events, chronological
DateEventDetail
December 17, 2020ReservedReserved by redhat
February 18, 2022PublishedPublished (CNA: redhat)
July 30, 2026ENRICHEDENRICHED — CVE-2021-20322 (kernel). Received CVSS 7.4 and CPE data from NVD.

Affected

Affected products and packages — 1 row
VendorProduct / PackageEcosystemVersion introducedFixed
n/akernel—4.15—

Weaknesses

CWE-330

References (9)

Related

Authoritative record: CVE-2021-20322 at cve.org

Weaknesses: CWE-330

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2021-20322 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.