01 Record

CVE-2026-0203

Junos OS: Receipt of a specifically malformed ICMP packet causes an FPC restart

HighPUBLISHEDCNA: juniper

CNA base score7.1 CVSS v4.0CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/AU:Y/R:A/RE:M/U:Amber

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02 Description

Junos OS: Receipt of a specifically malformed ICMP packet causes an FPC restart

03 Exploitation and scoring

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.26% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 18.1% of scored records. A rank, not a probability.

NVD base score

7.1 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:4.0/AV:A/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:A/V:X/RE:M/U:Amber

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2026-01-15 20:17Z9 MO AGO

Last updated

2026-03-10 22:44Z7 MO AGO

Reserved

2025-10-29

Assigning CNA

juniper

Record state

PUBLISHED

Severity

High (CVSS 7.1)

CNA CVSS vector

CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/AU:Y/R:A/RE:M/U:Amber

Weaknesses

CWE-755Improper Handling of Exceptional ConditionsClass

Data version

5.2

Document digest

001fae0542bdcb25e26636de0bfcff6bf54d7854b9c0df42ff6fb164458db1d7

05 Affected products

VendorProductVersionsPlatforms

Juniper NetworksJunos OS0 to < 21.2R3-S9, 21.4 to < 21.4R3-S10, 22.2 to < 22.2R3-S7, 22.3 to < 22.3R3-S4, 22.4 to < 22.4R3-S5, 23.2 to < 23.2R2-S3, 23.4 to < 23.4R2-S3, 24.2 to < 24.2R1-S2, 24.2R2—

06 References

supportportal.juniper.nethttps://supportportal.juniper.net/JSA104294vendor-advisory
kb.juniper.nethttps://kb.juniper.net/JSA104294vendor-advisory

07 Remediation

The following software releases have been updated to resolve this specific issue: Junos OS 20.2R3-S10, 21.2R3-S9, 21.4R3-S10, 22.2R3-S7, 22.3R3-S4, 22.4R3-S5, 23.2R2-S3, 23.4R2-S3, 24.2R1-S2, 24.2R2, 24.4R1, and all subsequent releases.