Riskcovery

CVE-2023-36842

Junos OS: jdhcpd will hang on receiving a specific DHCP packet

State
Published
Severity
6.5 Medium
Published
Jan 12, 2024
Updated
Jun 17, 2025
Reserved
Jun 27, 2023

Read the record on cve.org

Description

An Improper Check for Unusual or Exceptional Conditions vulnerability in Juniper DHCP Daemon (jdhcpd) of Juniper Networks Junos OS allows an adjacent, unauthenticated attacker to cause the jdhcpd to consume all the CPU cycles resulting in a Denial of Service (DoS).

On Junos OS devices with forward-snooped-client configured, if an attacker sends a specific DHCP packet to a non-configured interface, this will cause an infinite loop. The DHCP process will have to be restarted to recover the service.

This issue affects:

Juniper Networks Junos OS

* All versions earlier than 20.4R3-S9; * 21.2 versions earlier than 21.2R3-S7; * 21.3 versions earlier than 21.3R3-S5; * 21.4 versions earlier than 21.4R3-S5; * 22.1 versions earlier than 22.1R3-S4; * 22.2 versions earlier than 22.2R3-S3; * 22.3 versions earlier than 22.3R3-S2; * 22.4 versions earlier than 22.4R2-S2, 22.4R3; * 23.2 versions earlier than 23.2R2.

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
  • before 20.4R3-S9Affected
  • 21.2 to before 21.2R3-S7Affected
  • 21.3 to before 21.3R3-S5Affected
  • 21.4 to before 21.4R3-S5Affected
  • 22.1 to before 22.1R3-S4Affected
  • 22.2 to before 22.2R3-S3Affected
  • 22.3 to before 22.3R3-S2Affected
  • 22.4 to before 22.4R2-S2, 22.4R3Affected
  • 23.2 to before 23.2R2Affected

References

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