Improper Check for Unusual Conditions in Junos OS on SRX Series by Juniper Networks
CVE-2026-33790

8.7HIGH

Key Information:

Vendor

Juniper Networks
Status
Junos Os
Vendor
CVE Published:
9 April 2026

Badges

👾 Exploit Exists

What is CVE-2026-33790?

An improper check vulnerability in the flow daemon (flowd) of Junos OS on SRX Series devices allows attackers to exploit the system by sending a specially crafted, malformed ICMPv6 packet. This can lead to the srxpfe process crashing and restarting continuously, resulting in a persistent Denial of Service (DoS) condition. Importantly, this issue is exclusive to malformed ICMPv6 traffic and cannot be triggered by IPv4 or other types of IPv6 packets.

Affected Version(s)

Junos OS SRX Series 0 < 21.2R3-S10

Junos OS SRX Series 21.4 < 21.4R3-S12

Junos OS SRX Series 22.2 < 22.2R3-S8

References

https://kb.juniper.net/JSA107874
vendor-advisory

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

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