CVE-2025-30656

What it is

An Improper Handling of Additional Special Element vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS on MX Series with MS-MPC, MS-MIC and SPC3, and SRX Series, allows an unauthenticated, network-based attacker to cause a Denial-of-Service (DoS). If the SIP ALG processes specifically formatted SIP invites, a memory corruption will occur which will lead to a crash of the FPC processing these packets. Although the system will automatically recover with the restart of the FPC, subsequent SIP invites will cause the crash again and lead to a sustained DoS. This issue affects Junos OS on MX Series and SRX Series:  * all versions before 21.2R3-S9, * 21.4 versions before 21.4R3-S10, * 22.2 versions before 22.2R3-S6, * 22.4 versions before 22.4R3-S5, * 23.2 versions before 23.2R2-S3, * 23.4 versions before 23.4R2-S3, * 24.2 versions before 24.2R1-S2, 24.2R2.

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of service disruption.

Exploit odds

0.4% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2025-04-09 20:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 09:09 UTC Last updatedMost recent change to the record

Details

Published

2025-04-09 20:15 UTC

Last modified

2026-06-17 09:09 UTC

Exploit probability

0.4% · EPSS, next 30 days

Weakness

CWE-167

Record status

Analyzed

Affected

• Juniper Junos < 21.2
• Juniper Junos 21.2
• Juniper Junos 21.4
• Juniper Junos 22.2
• Juniper Junos 22.4
• Juniper Junos 23.2
• Juniper Junos 23.4
• Juniper Junos 24.2

Attack profile CVSS 4.0 · 8.7

Attack vector

Network

Complexity

Low

Attack requirements

None

Privileges needed

None

User interaction

None

Confidentiality

None

Integrity

None

Availability

High