CVE-2024-39519: acx7024 — Fix

Description

An Improper Check for Unusual or Exceptional Conditions vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS Evolved on ACX7000 Series allows an unauthenticated, adjacent attacker to cause a Denial-of-Service (DoS). On all ACX 7000 Series platforms running Junos OS Evolved, and configured with IRBs, if a Customer Edge device (CE) device is dual homed to two Provider Edge devices (PE) a traffic loop will occur when the CE sends multicast packets. This issue can be triggered by IPv4 and IPv6 traffic. This issue affects Junos OS Evolved: All versions from 22.2R1-EVO and later versions before 22.4R2-EVO, This issue does not affect Junos OS Evolved versions before 22.1R1-EVO.

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CVSS v3.1 Score

6.5

MEDIUM

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness Type (CWE)

CWE-754 CWE-754

Affected Products

Vendor	Product	Versions
juniper	junos_os_evolved	22.2 — 22.4
juniper	junos_os_evolved	All
juniper	junos_os_evolved	All
juniper	junos_os_evolved	All
juniper	junos_os_evolved	All
juniper	acx7024	All
juniper	acx7024x	All
juniper	acx7100-32c	All
juniper	acx7100-48l	All
juniper	acx7332	All
juniper	acx7348	All
juniper	acx7509	All

References

Advisories & Patches

https://supportportal.juniper.net/JSA82983 https://supportportal.juniper.net/JSA82983

Frequently Asked Questions

What is CVE-2024-39519? +

An Improper Check for Unusual or Exceptional Conditions vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS Evolved on ACX7000 Series allows an unauthenticated, adjacent attacker to cause a Denial-of-Service (DoS). On all ACX 7000 Series platforms running Junos OS Evolved, and configured with IRBs, if a Customer Edge device (CE) device is dual homed to two Provider Edge devices (PE) a traffic loop will occur when the CE sends multicast packets. This issue can be triggered by IPv4 and IPv6 traffic. This issue affects Junos OS Evolved: All versions from 22.2R1-EVO and later versions before 22.4R2-EVO, This issue does not affect Junos OS Evolved versions before 22.1R1-EVO. It has a CVSS v3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2024-39519? +

CVE-2024-39519 has a CVSS v3.1 score of 6.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2024-39519? +

CVE-2024-39519 affects products from juniper, specifically: acx7024, acx7024x, acx7100-32c, acx7100-48l, acx7332, acx7348, acx7509, junos_os_evolved. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2024-39519? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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