CVE-2026-0400: exploitation status and patch state

CVE-2026-0400 · CVSS 4.9 MEDIUM · EPSS <1%

A post-authentication Format String vulnerability in SonicOS allows a remote attacker to crash a firewall.

Is CVE-2026-0400 exploited?

• Not in the CISA KEV catalog.
• EPSS puts exploitation in the next 30 days at <1%.
• Public exploit code: none found in monitored sources.

Which products and versions are affected?

No affected package list recorded here yet.

Is there a patch?

No patch identifier recorded here yet.

What PlainSec published about CVE-2026-0400

• SonicOS Scan Spike May Foreshadow Next Advisory (2026-05-21)

Primary sources

• NVD record

What this record does not say

• No affected package data.
• No patch identifier.

KEV and EPSS are re-checked daily. Record last updated 2026-08-11.