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CVE-2026-21920

HIGH CVSS: 7.5 Published: 2026-01-15 Modified: 2026-06-17

Description

An Unchecked Return Value vulnerability in the DNS module of Juniper Networks Junos OS on SRX Series allows an unauthenticated, network-based attacker to cause a Denial-of-Service (DoS). If an SRX Series device configured for DNS processing, receives a specifically formatted DNS request flowd will crash and restart, which causes a service interruption until the process has recovered. This issue affects Junos OS on SRX Series: * 23.4 versions before 23.4R2-S5, * 24.2 versions before 24.2R2-S1, * 24.4 versions before 24.4R2. This issue does not affect Junos OS versions before 23.4R1.

Affected Platforms

Juniper Srx300Juniper Srx4600Juniper Srx345Juniper Srx5400Juniper Srx340Juniper Srx5800Juniper Srx2300Juniper Srx4700Juniper Srx4120Juniper Srx4100

Weakness Type

CWE-252

References