CVE-2023-22403: Junos OS: QFX10K Series: An ICCP flap will be observed due to excessive specific traffic

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-01-13 · updated 2026-06-17
Weakness: CWE-770

Description

An Allocation of Resources Without Limits or Throttling vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS allows a network-based, unauthenticated attacker to cause a Denial of Service (DoS). On QFX10K Series, Inter-Chassis Control Protocol (ICCP) is used in MC-LAG topologies to exchange control information between the devices in the topology. ICCP connection flaps and sync issues will be observed due to excessive specific traffic to the local device. This issue affects Juniper Networks Junos OS on QFX10K Series: * All versions prior to 20.2R3-S7; * 20.4 versions prior to 20.4R3-S4; * 21.1 versions prior to 21.1R3-S3; * 21.2 versions prior to 21.2R3-S1; * 21.3 versions prior to 21.3R3; * 21.4 versions prior to 21.4R3; * 22.1 versions prior to 22.1R2.

Affected products

Juniper Junos OS: before 20.2; 20.2, 20.2-r1, 20.2-r1-s1, 20.2-r1-s2, 20.2-r1-s3, 20.2-r2 (+54) — fixed in 20.2

How to fix

Upgrade to a fixed version: Juniper Junos OS 20.2. Check the vendor advisory for mitigations.

References

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