Is CVE-2024-21595 actively exploited?

No active exploitation of CVE-2024-21595 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2024-21595 be exploited remotely?

Yes. CVE-2024-21595 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2024-21595?

CVE-2024-21595 has a CVSS score of 7.5 (HIGH).

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HIGH

CVE-2024-21595

CWE-1286Published: January 12, 2024· Updated: Jun 17, 2026

7.5

CVSS v3.1

Official Description

An Improper Validation of Syntactic Correctness of Input vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS allows a network-based, unauthenticated attacker to cause a Denial of Service (DoS).

If an attacker sends high rate of specific ICMP traffic to a device with VXLAN configured, this causes a deadlock of the PFE and results in the device becoming unresponsive. A manual restart will be required to recover the device.

This issue only affects EX4100, EX4400, EX4600, QFX5000 Series devices.

This issue affects:

Juniper Networks Junos OS

* 21.4R3 versions earlier than 21.4R3-S4;

* 22.1R3 versions earlier than 22.1R3-S3;

* 22.2R2 versions earlier than 22.2R3-S1;

* 22.3 versions earlier than 22.3R2-S2, 22.3R3;

* 22.4 versions earlier than 22.4R2;

* 23.1 versions earlier than 23.1R2.

NVD Source

Technical Analysis

CVE-2024-21595 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.