Juniper Junos OS SRX DoS via malformed ICMPv6 pre25.2R2-S2
CVE-2026-33790 Published on April 9, 2026
Junos OS: SRX Series: In a NAT64 configuration, receipt of a specific, malformed ICMPv6 packet will cause the srxpfe process to crash and restart.
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.
Vulnerability Analysis
CVE-2026-33790 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.
Weakness Type
Improper Check for Unusual or Exceptional Conditions
The software does not check or incorrectly checks for unusual or exceptional conditions that are not expected to occur frequently during day to day operation of the software.
Products Associated with CVE-2026-33790
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Affected Versions
Juniper Networks Junos OS:- Before 21.2R3-S10 is affected.
- Version 21.4 and below 21.4R3-S12 is affected.
- Version 22.2 and below 22.2R3-S8 is affected.
- Version 22.4 and below 22.4R3-S9 is affected.
- Version 23.2 and below 23.2R2-S6 is affected.
- Version 23.4 and below 23.4R2-S7 is affected.
- Version 24.2 and below 24.2R2-S3 is affected.
- Version 24.4 and below 24.4R2-S3 is affected.
- Version 25.2 and below 25.2R1-S2, 25.2R2 is affected.
- Version 21.3 and below 21.3* is affected.
- Version 22.1 and below 22.1* is affected.
- Version 22.3 and below 22.3* is affected.