CVE-2024-21604

Summary

An Allocation of Resources Without Limits or Throttling vulnerability in the kernel of Juniper Networks Junos OS Evolved allows an unauthenticated, network-based attacker to cause a Denial of Service (DoS).

If a high rate of specific valid packets are processed by the routing engine (RE) this will lead to a loss of connectivity of the RE with other components of the chassis and thereby a complete and persistent system outage. Please note that a carefully designed lo0 firewall filter will block or limit these packets which should prevent this issue from occurring.

The following log messages can be seen when this issue occurs:

<host> kernel: nf_conntrack: nf_conntrack: table full, dropping packet This issue affects Juniper Networks Junos OS Evolved:

• All versions earlier than 20.4R3-S7-EVO;
• 21.2R1-EVO and later versions;
• 21.4-EVO versions earlier than 21.4R3-S5-EVO;
• 22.1-EVO versions earlier than 22.1R3-S2-EVO;
• 22.2-EVO versions earlier than 22.2R3-EVO;
• 22.3-EVO versions earlier than 22.3R2-EVO;
• 22.4-EVO versions earlier than 22.4R2-EVO.

Affected Software

Weaknesses

• CWE-770: CWE-770 Allocation of Resources Without Limits or Throttling
• Denial of Service (DoS)

Workarounds

To prevent the device from receiving high rates of valid traffic please configure firewall filters to block unexpected and even throttle expected traffic.

ADP Enrichment

CVE Program Container

Additional References

• https://supportportal.juniper.net/JSA75745
• https://www.first.org/cvss/calculator/4.0#CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: yes
  • Technical Impact: partial

References

• https://supportportal.juniper.net/JSA75745
• https://www.first.org/cvss/calculator/4.0#CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L

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