Riskcovery

CVE-2023-36849

Junos OS and Junos OS Evolved: The l2cpd will crash when a malformed LLDP packet is received

State
Published
Severity
6.5 Medium
Published
Jul 14, 2023
Updated
Oct 22, 2024
Reserved
Jun 27, 2023

Read the record on cve.org

Description

An Improper Check or Handling of Exceptional Conditions vulnerability in the Layer-2 control protocols daemon (l2cpd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated adjacent attacker to cause a Denial of Service (DoS).

When a malformed LLDP packet is received, l2cpd will crash and restart. The impact of the l2cpd crash is reinitialization of STP protocols (RSTP, MSTP or VSTP), and MVRP and ERP. Also, if any services depend on LLDP state (like PoE or VoIP device recognition), then these will also be affected. Continued receipt of such packets will lead to a sustained Denial of Service.

This issue affects: Juniper Networks Junos OS 21.4 versions prior to 21.4R3-S3; 22.1 versions prior to 22.1R3-S3; 22.2 versions prior to 22.2R2-S1, 22.2R3; 22.3 versions prior to 22.3R2.

Juniper Networks Junos OS Evolved 21.4-EVO versions prior to 21.4R3-S2-EVO; 22.1-EVO versions prior to 22.1R3-S3-EVO; 22.2-EVO versions prior to 22.2R2-S1-EVO, 22.2R3-EVO; 22.3-EVO versions prior to 22.3R2-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-703 Improper Check or Handling of Exceptional Conditions

Affected Products

ProductVersions
Junos OSJuniper Networks
  • 21.4 to before 21.4R3-S3Affected
  • 22.1 to before 22.1R3-S3Affected
  • 22.2 to before 22.2R2-S1, 22.2R3Affected
  • 22.3 to before 22.3R2Affected
Junos OS EvolvedJuniper Networks
  • 21.4 to before 21.4R3-S2-EVOAffected
  • 22.1 to before 22.1R3-S3-EVOAffected
  • 22.2 to before 22.2R2-S1-EVO, 22.2R3-EVOAffected
  • 22.3 to before 22.3R2-EVOAffected

References

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