What is CVE-2026-33790?

CVE-2026-33790 is a high-severity vulnerability in Juniper Junos, classified under Improper Check for Unusual or Exceptional Conditions. CVSS score: 7.5/10. Published 2026-04-09.

How severe is CVE-2026-33790?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Juniper Junos

CVE-2026-33790

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…

EPSS: 0.003 (25.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Juniper Junos — versions 21.2, 21.3, 21.4
Juniper Srx1500
Juniper Srx1600
Juniper Srx2300
Juniper Srx300
Juniper Srx320
Juniper Srx340
Juniper Srx345
Juniper Srx380
Juniper Srx4100

Weakness classification (CWE)

CWE-754 — Improper Check for Unusual or Exceptional Conditions

References

sirt@juniper.net (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2026-33790?: CVE-2026-33790 is a high-severity vulnerability in Juniper Junos, classified under Improper Check for Unusual or Exceptional Conditions. CVSS score: 7.5/10. Published 2026-04-09.
How severe is CVE-2026-33790?: High severity. CVSS v3 base score is 7.5 out of 10.