CVE-2026-0203

CWE-755 — Improper Exception Handling4 documents4 sources
Severity
7.1HIGH
EPSS
0.0%
top 99.51%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
Juniper Networks Junos OSJuniper Junos
Timeline
PublishedJan 15

Description

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 restart, resulting in a Denial of Service (DoS). When an ICMP packet is received with a specifically malformed IP header value, the FPC receiving the packet crashes and restarts. Due to the specific type of malformed packet, adjacent upstream routers would not…

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

Affected Packages2 packages

▶CVEListV5juniper_networks/junos_os21.4 — 21.4R3-S10+7
▶NVDjuniper/junos< 21.2+8

🔴Vulnerability Details

2
GHSA
GHSA-x6px-8wp8-5cwq: An Improper Handling of Exceptional Conditions vulnerability in packet processing of Juniper Networks Junos OS allows an unauthenticated, network-adja↗2026-01-15
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CVEList
Junos OS: Receipt of a specifically malformed ICMP packet causes an FPC restart↗2026-01-15
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📋Vendor Advisories

1
Juniper
CVE-2026-0203: An Improper Handling of Exceptional Conditions vulnerability in packet processing of Juniper Networks Junos OS allows an unauthenticated, network-adja↗2026-01-15
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