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CVE-2025-30649

Junos OS: MX240, MX480, MX960 with SPC3: An attacker sending specific packets will cause a CPU utilization DoS.

HIGH
7.5
CVSS Score
Published: April 9, 2025 at 07:55 PM UTC
Updated: June 17, 2026 at 09:09 AM UTC
1 product affected across 1 vendorJunos

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Severity
HIGH7.5
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

Description

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Junos· Juniper Networks
95%
v < 22.2v < 22.2R3-S622.4 ≤ v < 22.4R3-S423.2 ≤ v < 23.2R2-S323.4 ≤ v < 23.4R2-S424.2 ≤ v < 24.2R1-S2, 24.2R222.222.2 r122.2 r1-s122.2 r1-s222.2 r222.2 r2-s122.2 r2-s222.2 r322.2 r3-s122.2 r3-s222.2 r3-s322.2 r3-s422.2 r3-s522.422.4 r122.4 r1-s122.4 r1-s222.4 r222.4 r2-s122.4 r2-s222.4 r322.4 r3-s122.4 r3-s222.4 r3-s323.223.2 r123.2 r1-s123.2 r1-s223.2 r223.2 r2-s123.2 r2-s223.423.4 r123.4 r1-s123.4 r1-s223.4 r223.4 r2-s123.4 r2-s223.4 r2-s324.224.2 r124.2 r1-s124.2 r2
Affected range stops below 22.2R3-S6, so it looks safe — our inference, not a vendor statement
Affected range stops below 22.4R3-S4, so it looks safe — our inference, not a vendor statement
Affected range stops below 23.2R2-S3, so it looks safe — our inference, not a vendor statement
Affected range stops below 23.4R2-S4, so it looks safe — our inference, not a vendor statement
Affected range stops below 24.2R1-S2, 24.2R2, so it looks safe — our inference, not a vendor statement
juniper-mx-spc3 (environment) · juniper-mx240 (environment) · juniper-mx480 (environment) · juniper-mx960 (environment)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor Advisory
Source: [email protected]
https://supportportal.juniper.net/JSA96459

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHjuniper
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-20

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