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CVE PROGRAM SOURCE RECORD8.7 High

CVE-2026-21920

Junos OS: SRX Series: If a specific request is processed by the DNS subsystem flowd will crash

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Status
Published
Published
Updated
Assigning organization
juniper

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 products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Juniper Networks Junos OS

Default version status: unaffected

  • 23.4 to < 23.4R2-S5affected
  • 24.2 to < 24.2R2-S1affected
  • 24.4 to < 24.4R2affected
  • 0 to < 23.4R1unaffected

References