What is CVE-2026-0203?

CVE-2026-0203 is a medium-severity vulnerability in Juniper Junos, classified under Improper Handling of Exceptional Conditions. CVSS score: 6.5/10. Published 2026-01-15.

How severe is CVE-2026-0203?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Juniper Junos

CVE-2026-0203

An Improper Handling of Exceptional Conditions vulnerability in packet processing of Juniper Networks Junos OS allows an unauthenticated, network-adjacent attacker sending a specifically malformed ICMP packet to cause an FPC to crash and r…

EPSS: 0.002 (16.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Juniper Junos — versions 21.2, 21.4, 22.2
Juniper Networks Junos Os — versions 0, 21.4, 22.2

Weakness classification (CWE)

CWE-755 — Improper Handling of Exceptional Conditions

References

sirt@juniper.net (vendor-advisory, Vendor Advisory)
sirt@juniper.net (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2026-0203?: CVE-2026-0203 is a medium-severity vulnerability in Juniper Junos, classified under Improper Handling of Exceptional Conditions. CVSS score: 6.5/10. Published 2026-01-15.
How severe is CVE-2026-0203?: Medium severity. CVSS v3 base score is 6.5 out of 10.