Riskcovery

CVE-2021-31362

Junos OS and Junos OS Evolved: An IS-IS adjacency might be taken down if a bad hello PDU is received for an existing adjacency causing a DoS

State
Published
Severity
6.5 Medium
Published
Oct 19, 2021
Updated
Sep 17, 2024
Reserved
Apr 15, 2021

Read the record on cve.org

Description

A Protection Mechanism Failure vulnerability in RPD (routing protocol daemon) of Juniper Networks Junos OS and Junos OS Evolved allows an adjacent unauthenticated attacker to cause established IS-IS adjacencies to go down by sending a spoofed hello PDU leading to a Denial of Service (DoS) condition. Continued receipted of these spoofed PDUs will create a sustained Denial of Service (DoS) condition. This issue affects: Juniper Networks Junos OS All versions prior to 18.2R3-S8; 18.3 versions prior to 18.3R3-S5; 18.4 versions prior to 18.4R3-S9; 19.1 versions prior to 19.1R3-S7; 19.2 versions prior to 19.2R1-S7, 19.2R3-S3; 19.3 versions prior to 19.3R2-S6, 19.3R3-S2; 19.4 versions prior to 19.4R3-S3; 20.1 versions prior to 20.1R3; 20.2 versions prior to 20.2R3; 20.3 versions prior to 20.3R3; 20.4 versions prior to 20.4R2. Juniper Networks Junos OS Evolved All versions prior to 20.4R2-EVO; 21.1 versions prior to 21.1R2-EVO.

Scores

CVSSScoreVectorSource
3.16.5 MediumCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hjuniper

Weaknesses

  • CWE-693 Protection Mechanism Failure

Affected Products

ProductVersions
Junos OSJuniper Networks
  • before 18.2R3-S8Affected
  • 18.3 to before 18.3R3-S5Affected
  • 18.4 to before 18.4R3-S9Affected
  • 19.1 to before 19.1R3-S7Affected
  • 19.2 to before 19.2R1-S7, 19.2R3-S3Affected
  • 19.3 to before 19.3R2-S6, 19.3R3-S2Affected
  • 19.4 to before 19.4R3-S3Affected
  • 20.1 to before 20.1R3Affected
  • 20.2 to before 20.2R3Affected
  • 20.3 to before 20.3R3Affected
  • 20.4 to before 20.4R2Affected
Junos OS EvolvedJuniper Networks
  • before 20.4R2-EVOAffected
  • 21.1 to before 21.1R2-EVOAffected

References

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