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High severity7.5NVD Advisory· Published Jan 12, 2024· Updated Jun 17, 2026

CVE-2024-21595

CVE-2024-21595

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

24
  • Juniper Networks/Junos24 versions
    cpe:2.3:o:juniper:junos:21.4:r3-s1:*:*:*:*:*:*+ 23 more
    • cpe:2.3:o:juniper:junos:21.4:r3-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:21.4:r3-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:21.4:r3-s3:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:21.4:r3:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:22.1:r3-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:22.1:r3-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:22.1:r3:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:22.2:r2-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:22.2:r2-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:22.2:r2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:22.2:r3:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:22.3:-:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:22.3:r1-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:22.3:r1-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:22.3:r1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:22.3:r2-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:22.3:r2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:22.4:-:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:22.4:r1-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:22.4:r1-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:22.4:r1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:23.1:r1:*:*:*:*:*:*
    • (no CPE)range: 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
    • (no CPE)range: 21.4R3

Patches

Vulnerability mechanics

References

2

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