PT-2026-21746 · Sonicwall · Sonicos

Published 2026-02-24 · Updated 2026-05-22 · CVE-2026-0400

Positive Technologies (AI Summary)

CVSS v3.1

4.9

Medium

Base vector

AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions SonicOS (affected versions not specified)

Description A post-authentication format string issue exists in SonicOS. This can allow a remote attacker to cause a firewall to crash.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Use of Externally-Controlled Format String

Weakness Enumeration

CWE-134

Related Identifiers

CVE-2026-0400

Affected Products

Sonicos

References · 10

• https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2026-0001 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-0400 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-0400 · Security Note
• https://twitter.com/ohhara_shiojiri/status/2057686407548920246 · Twitter Post
• https://t.me/aptreports/29106 · Telegram Post
• https://twitter.com/DFIR_Radar/status/2057583089975505224 · Twitter Post
• https://twitter.com/GreyNoiseIO/status/2057492959700865296 · Twitter Post
• https://t.me/aptreports/29104 · Telegram Post
• https://twitter.com/CVEnew/status/2026676466709340375 · Twitter Post
• https://twitter.com/rst_cloud/status/2057869105206575510 · Twitter Post