Denial of Service Vulnerability in Juniper Networks Junos OS
CVE-2026-0203

7.1HIGH

Key Information:

Vendor

Juniper Networks
Status
Junos Os
Vendor
CVE Published:
15 January 2026

Badges

👾 Exploit Exists

What is CVE-2026-0203?

An improper handling of exceptional conditions vulnerability in the packet processing of Juniper Networks Junos OS allows unauthenticated network-adjacent attackers to send specifically malformed ICMP packets. Upon receipt, these packets can cause the Flow Processing Component (FPC) to crash and restart, resulting in a denial of service. This vulnerability affects only ICMPv4 packets, limiting the attack surface to adjacent networks, as upstream routers do not forward malformed packets.

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Affected Version(s)

Junos OS 0 < 21.2R3-S9

Junos OS 21.4 < 21.4R3-S10

Junos OS 22.2 < 22.2R3-S7

References

https://supportportal.juniper.net/JSA104294
vendor-advisory
https://kb.juniper.net/JSA104294
vendor-advisory

CVSS V4

Score:
7.1
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Adjacent Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

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