An Improper Restriction of Excessive Authentication Attempts vulnerability in Juniper Networks Junos OS Evolved allows an unauthenticated, network-based attacker to cause a limited Denial of Service (DoS) to the management plane.

When an incoming connection was blocked because it exceeded the connections-per-second rate-limit, the system doesn't consider existing connections anymore for subsequent connection attempts so that the connection limit can be exceeded.
This issue affects Junos OS Evolved:

All versions before 21.4R3-S4-EVO,

22.1-EVO versions before 22.1R3-S3-EVO,

22.2-EVO versions before 22.2R3-S2-EVO, 

22.3-EVO versions before 22.3R2-S1-EVO, 22.3R3-EVO.

References

• https://nvd.nist.gov/vuln/detail/CVE-2024-30390
• 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:L/SC:N/SI:N/SA:N
• http://supportportal.juniper.net/JSA79183