CVE-2026-33790: Junos OS: SRX Series: In a NAT64 configuration, receipt of a specific, malformed ICMPv6 packet will cause the srxpfe process to crash and restart.

Published Apr 9, 2026
·
Updated

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

127 affected components
Juniper Networks Junos OS on SRX Series<21.2R3-S10, >=21.3<=21.3, >=21.4<21.4R3-S12, >=22.1<=22.1, >=22.2<22.2R3-S8, >=22.4<=22.4, >=22.4<22.4R3-S9, >=23.2<23.2R2-S6, >=23.4<23.4R2-S7, >=24.2<24.2R2-S3, >=24.4<24.4R2-S3, >=25.2<25.2R1-S2, =25.2R2
All of the following
Any of the following
Juniper Junos<21.2
Juniper Junos=21.2
Juniper Junos=21.2-r1
Juniper Junos=21.2-r1-s1
Juniper Junos=21.2-r1-s2
Juniper Junos=21.2-r2
Juniper Junos=21.2-r2-s1
Juniper Junos=21.2-r2-s2
Juniper Junos=21.2-r3
Juniper Junos=21.2-r3-s1
Juniper Junos=21.2-r3-s2
Juniper Junos=21.2-r3-s3
Juniper Junos=21.2-r3-s4
Juniper Junos=21.2-r3-s5
Juniper Junos=21.2-r3-s6
Juniper Junos=21.2-r3-s7
Juniper Junos=21.2-r3-s8
Juniper Junos=21.2-r3-s9
Juniper Junos=21.3
Juniper Junos=21.4
Juniper Junos=21.4-r1
Juniper Junos=21.4-r1-s1
Juniper Junos=21.4-r1-s2
Juniper Junos=21.4-r2
Juniper Junos=21.4-r2-s1
Juniper Junos=21.4-r2-s2
Juniper Junos=21.4-r3
Juniper Junos=21.4-r3-s1
Juniper Junos=21.4-r3-s10
Juniper Junos=21.4-r3-s11
Juniper Junos=21.4-r3-s2
Juniper Junos=21.4-r3-s3
Juniper Junos=21.4-r3-s4
Juniper Junos=21.4-r3-s5
Juniper Junos=21.4-r3-s6
Juniper Junos=21.4-r3-s7
Juniper Junos=21.4-r3-s8
Juniper Junos=21.4-r3-s9
Juniper Junos=22.1
Juniper Junos=22.2
Juniper Junos=22.2-r1
Juniper Junos=22.2-r1-s1
Juniper Junos=22.2-r1-s2
Juniper Junos=22.2-r2
Juniper Junos=22.2-r2-s1
Juniper Junos=22.2-r2-s2
Juniper Junos=22.2-r3
Juniper Junos=22.2-r3-s1
Juniper Junos=22.2-r3-s2
Juniper Junos=22.2-r3-s3
Juniper Junos=22.2-r3-s4
Juniper Junos=22.2-r3-s5
Juniper Junos=22.2-r3-s6
Juniper Junos=22.2-r3-s7
Juniper Junos=22.4
Juniper Junos=22.4-r1
Juniper Junos=22.4-r1-s1
Juniper Junos=22.4-r1-s2
Juniper Junos=22.4-r2
Juniper Junos=22.4-r2-s1
Juniper Junos=22.4-r2-s2
Juniper Junos=22.4-r3
Juniper Junos=22.4-r3-s1
Juniper Junos=22.4-r3-s2
Juniper Junos=22.4-r3-s3
Juniper Junos=22.4-r3-s4
Juniper Junos=22.4-r3-s5
Juniper Junos=22.4-r3-s6
Juniper Junos=22.4-r3-s7
Juniper Junos=22.4-r3-s8
Juniper Junos=23.2
Juniper Junos=23.2-r1
Juniper Junos=23.2-r1-s1
Juniper Junos=23.2-r1-s2
Juniper Junos=23.2-r2
Juniper Junos=23.2-r2-s1
Juniper Junos=23.2-r2-s2
Juniper Junos=23.2-r2-s3
Juniper Junos=23.2-r2-s4
Juniper Junos=23.2-r2-s5
Juniper Junos=23.4
Juniper Junos=23.4-r1
Juniper Junos=23.4-r1-s1
Juniper Junos=23.4-r1-s2
Juniper Junos=23.4-r2
Juniper Junos=23.4-r2-s1
Juniper Junos=23.4-r2-s2
Juniper Junos=23.4-r2-s3
Juniper Junos=23.4-r2-s4
Juniper Junos=23.4-r2-s5
Juniper Junos=23.4-r2-s6
Juniper Junos=24.2
Juniper Junos=24.2-r1
Juniper Junos=24.2-r1-s1
Juniper Junos=24.2-r1-s2
Juniper Junos=24.2-r2
Juniper Junos=24.2-r2-s1
Juniper Junos=24.2-r2-s2
Juniper Junos=24.4
Juniper Junos=24.4-r1
Juniper Junos=24.4-r1-s2
Juniper Junos=24.4-r1-s3
Juniper Junos=24.4-r2
Juniper Junos=24.4-r2-s1
Juniper Junos=24.4-r2-s2
Juniper Junos=25.2
Juniper Junos=25.2-r1
Juniper Junos=25.2-r1-s1
Juniper Junos=25.2-r2
Any of the following
Juniper SRX1500
Juniper SRX1600
Juniper SRX2300
Juniper SRX300
Juniper SRX320
Juniper SRX340
Juniper SRX345
Juniper Srx380
Juniper SRX4100
Juniper Srx4120
Juniper SRX4200
Juniper SRX4300
Juniper SRX4600
Juniper SRX4700
Juniper SRX5400
Juniper SRX5600
Juniper SRX5800

Remediation

Information

The following software releases have been updated to resolve this specific issue: Junos OS: 21.2R3-S10, 21.4R3-S12, 22.4R3-S9, 23.2R2-S6, 23.4R2-S7, 24.2R2-S3, 24.4R2-S3, 25.2R1-S2, 25.2R2, 25.4R1, and all subsequent releases.

Event History

Apr 9, 2026
CVE Published
via MITRE·09:38 PM
Data Sourced
via MITRE·09:38 PM
RemedyDescriptionSeverityWeakness
Data Sourced
via NVD·10:16 PM
DescriptionSeverityWeaknessAffected Software
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Frequently Asked Questions

1

What is the severity of CVE-2026-33790?

CVE-2026-33790 has been assigned a severity rating indicating that it poses a significant risk to systems running affected versions of Junos OS on SRX Series.

2

How do I fix CVE-2026-33790?

To fix CVE-2026-33790, upgrade to a fixed version of Junos OS as specified in Juniper Networks' security advisories.

3

What types of devices are impacted by CVE-2026-33790?

CVE-2026-33790 affects various models of Juniper Networks SRX Series devices running specific versions of Junos OS.

4

What are the symptoms of an exploitation of CVE-2026-33790?

Exploitation of CVE-2026-33790 may lead to the crashing and restarting of the srxpfe process within the affected systems.

5

Is CVE-2026-33790 being actively exploited in the wild?

There is currently no public indication that CVE-2026-33790 is being actively exploited, but it remains a critical vulnerability.

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