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CVE PROGRAM SOURCE RECORD8.7 High

CVE-2026-21918

Junos OS: SRX and MX Series: When TCP packets occur in a specific sequence flowd crashes

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Status
Published
Published
Updated
Assigning organization
juniper

Description

A Double Free vulnerability in the flow processing daemon (flowd) of Juniper Networks Junos OS on SRX and MX Series allows an unauthenticated, network-based attacker to cause a Denial-of-Service (DoS). On all SRX and MX Series platforms, when during TCP session establishment a specific sequence of packets is encountered a double free happens. This causes flowd to crash and the respective FPC to restart. This issue affects Junos OS on SRX and MX Series: * all versions before 22.4R3-S7, * 23.2 versions before 23.2R2-S3, * 23.4 versions before 23.4R2-S4, * 24.2 versions before 24.2R2.

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

  • 0 to < 22.4R3-S7affected
  • 23.2 to < 23.2R2-S3affected
  • 23.4 to < 23.4R2-S4affected
  • 24.2 to < 24.2R2affected

References