Improper handling of exceptional conditions in Junos OS - CVE-2026-0203
Published: January 20, 2026
Vulnerability identifier: #VU121696
CSH Severity: Medium
CVSS v4: 7.1 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-0203
CWE-ID: CWE-755
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to improper handling of exceptional conditions error in packet processing. A remote non-authenticated attacker can cause an FPC to crash and restart, resulting in a Denial of Service (DoS).
Affected software
Junos OS
How to mitigate CVE-2026-0203
Install updates from vendor's website.
Junos OS - addressed in versions 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