CVE-2025-30649: Junos OS: MX240, MX480, MX960 with SPC3: An attacker sending specific packets will cause a CPU utilization DoS.
An Improper Input Validation vulnerability in the syslog stream TCP transport of Juniper Networks Junos OS on MX240, MX480 and MX960 devices with MX-SPC3 Security Services Card allows an unauthenticated, network-based attacker, to send specific spoofed packets to cause a CPU Denial of Service (DoS) to the MX-SPC3 SPUs.
Continued receipt and processing of these specific packets will sustain the DoS condition.
This issue affects Junos OS: All versions before 22.2R3-S6, from 22.4 before 22.4R3-S4, from 23.2 before 23.2R2-S3, from 23.4 before 23.4R2-S4, from 24.2 before 24.2R1-S2, 24.2R2
An indicator of compromise will indicate the SPC3 SPUs utilization has spiked.
For example: user@device> show services service-sets summary Service sets CPU Interface configured Bytes used Session bytes used Policy bytes used utilization "interface" 1 "bytes" (percent%) "sessions" ("percent"%) "bytes" ("percent"%) 99.97 % OVLD <<<<<< look for high CPU usage
Affected Software
Remediation
Information
Event History
Frequently Asked Questions
What is the severity of CVE-2025-30649?
CVE-2025-30649 is a high severity vulnerability that allows unauthenticated attackers to cause a CPU Denial of Service on affected Juniper devices.
How do I fix CVE-2025-30649?
To fix CVE-2025-30649, upgrade to Junos OS version 22.2R3-S6 or later.
Which devices are affected by CVE-2025-30649?
CVE-2025-30649 affects Juniper Networks MX240, MX480, and MX960 devices with the MX-SPC3 Security Services Card.
What type of attack does CVE-2025-30649 enable?
CVE-2025-30649 enables attackers to send spoofed packets that can lead to a CPU Denial of Service.
Is user authentication required to exploit CVE-2025-30649?
No, CVE-2025-30649 can be exploited by unauthenticated, network-based attackers.