Widely deployed Juniper SRX firewalls; DoS could disrupt network perimeter across many organizations.
CVE-2026-33790
DoS in Junos SRX flowd via malformed ICMPv6 packet.
Is CVE-2026-33790 being exploited?
Not confirmed. CVE-2026-33790 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.33% probability of exploitation in the next 30 days.
How severe is CVE-2026-33790?
CVE-2026-33790 is rated High with a CVSS score of 8.7. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-33790?
Yes. A fix has been recorded for CVE-2026-33790. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-33790 affect?
CVE-2026-33790 affects Juniper Networks Junos OS (SRX Series). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-33790?
Plan upgrade to fixed Junos SRX releases when available
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
ICMPv6-based DoS crashes srxpfe, rebooting SRX devices and disrupting firewall services.
Monitor only
- affected< 21.2R3-S10
- affected>= 21.4 and < 21.4R3-S12
- affected>= 22.2 and < 22.2R3-S8
- affected>= 22.4 and < 22.4R3-S9
- affected>= 23.2 and < 23.2R2-S6
- affected>= 23.4 and < 23.4R2-S7
- affected>= 24.2 and < 24.2R2-S3
- affected>= 24.4 and < 24.4R2-S3
- affected>= 25.2 and < 25.2R1-S2, 25.2R2
- affected>= 21.3 and < 21.3*
- affected>= 22.1 and < 22.1*
- affected>= 22.3 and < 22.3*
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.