CVE-2025-30649

published 2025-04-09

CVE-2025-30649: 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…

high 8.7 CVSS 4.0

AV N AC L AT N PR N UI N VC N VI N VA H SC N SI N SA L E X CR X IR X AR X MAV X MAC X MAT X MPR X MUI X MVC X MVI X MVA X MSC X MSI X MSA X S X AU Y R U V C RE M U Amber

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

12 ranges

Vendor	Product	Version range	Fixed in
juniper	junos	< 22.2	22.2
juniper	junos	—	—
juniper	junos	—	—
juniper	junos	—	—
juniper	junos	—	—
juniper	junos	—	—
juniper	junos_os	—	—
juniper_networks	junos_os	< 22.2R3-S6	22.2R3-S6
juniper_networks	junos_os	>= 22.4 < 22.4R3-S4	22.4R3-S4
juniper_networks	junos_os	>= 23.2 < 23.2R2-S3	23.2R2-S3
juniper_networks	junos_os	>= 23.4 < 23.4R2-S4	23.4R2-S4
juniper_networks	junos_os	>= 24.2 < 24.2R1-S2, 24.2R2	24.2R1-S2, 24.2R2

CWE-20