CVE-2026-33790

Summary

An Improper Check for Unusual or Exceptional Conditions vulnerability in the flow daemon (flowd) of Juniper Networks Junos OS on SRX Series allows an attacker sending a specific, malformed ICMPv6 packet to cause the srxpfe process to crash and restart. Continued receipt and processing of these packets will repeatedly crash the srxpfe process and sustain the Denial of Service (DoS) condition.

During NAT64 translation, receipt of a specific, malformed ICMPv6 packet destined to the device will cause the srxpfe process to crash and restart.

This issue cannot be triggered using IPv4 nor other IPv6 traffic.

This issue affects Junos OS on SRX Series:

  • all versions before 21.2R3-S10,
  • all versions of 21.3,
  • from 21.4 before 21.4R3-S12,
  • all versions of 22.1,
  • from 22.2 before 22.2R3-S8,
  • all versions of 22.4,
  • from 22.4 before 22.4R3-S9,
  • from 23.2 before 23.2R2-S6,
  • from 23.4 before 23.4R2-S7,
  • from 24.2 before 24.2R2-S3,
  • from 24.4 before 24.4R2-S3,
  • from 25.2 before 25.2R1-S2, 25.2R2.

Affected Software

VendorProductVersion RangeStatus
Juniper NetworksJunos OS0 < 21.2R3-S10affected
Juniper NetworksJunos OS21.4 < 21.4R3-S12affected
Juniper NetworksJunos OS22.2 < 22.2R3-S8affected
Juniper NetworksJunos OS22.4 < 22.4R3-S9affected
Juniper NetworksJunos OS23.2 < 23.2R2-S6affected
Juniper NetworksJunos OS23.4 < 23.4R2-S7affected
Juniper NetworksJunos OS24.2 < 24.2R2-S3affected
Juniper NetworksJunos OS24.4 < 24.4R2-S3affected
Juniper NetworksJunos OS25.2 < 25.2R1-S2, 25.2R2affected
Juniper NetworksJunos OS21.3 < 21.3*affected
Juniper NetworksJunos OS22.1 < 22.1*affected
Juniper NetworksJunos OS22.3 < 22.3*affected

Weaknesses

  • CWE-754: CWE-754 Improper Check for Unusual or Exceptional Conditions

Workarounds

There are no known workarounds for this issue.

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: yes
    • Technical Impact: partial

References