Riskcovery

CVE-2024-21607

Junos OS: MX Series and EX9200 Series: If the "tcp-reset" option used in an IPv6 filter, matched packets are accepted instead of rejected

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

Read the record on cve.org

Description

An Unsupported Feature in the UI vulnerability in Juniper Networks Junos OS on MX Series and EX9200 Series allows an unauthenticated, network-based attacker to cause partial impact to the integrity of the device.

If the "tcp-reset" option is added to the "reject" action in an IPv6 filter which matches on "payload-protocol", packets are permitted instead of rejected. This happens because the payload-protocol match criteria is not supported in the kernel filter causing it to accept all packets without taking any other action. As a fix the payload-protocol match will be treated the same as a "next-header" match to avoid this filter bypass.

This issue doesn't affect IPv4 firewall filters.

This issue affects Juniper Networks Junos OS on MX Series and EX9200 Series:

* All versions earlier than 20.4R3-S7; * 21.1 versions earlier than 21.1R3-S5; * 21.2 versions earlier than 21.2R3-S5; * 21.3 versions earlier than 21.3R3-S4; * 21.4 versions earlier than 21.4R3-S4; * 22.1 versions earlier than 22.1R3-S2; * 22.2 versions earlier than 22.2R3-S2; * 22.3 versions earlier than 22.3R2-S2, 22.3R3; * 22.4 versions earlier than 22.4R1-S2, 22.4R2-S2, 22.4R3.

Scores

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

Weaknesses

  • CWE-447 Unimplemented or Unsupported Feature in UI

Affected Products

ProductVersions
Junos OSJuniper Networks
  • before 20.4R3-S7Affected
  • 21.1 to before 21.1R3-S5Affected
  • 21.2 to before 21.2R3-S5Affected
  • 21.3 to before 21.3R3-S4Affected
  • 21.4 to before 21.4R3-S4Affected
  • 22.1 to before 22.1R3-S2Affected
  • 22.2 to before 22.2R3-S2Affected
  • 22.3 to before 22.3R2-S2, 22.3R3Affected
  • 22.4 to before 22.4R1-S2, 22.4R2-S2, 22.4R3Affected

References

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