CVE-2026-0204

High

Published: 29 April 2026

Published

29 April 2026

Modified

05 May 2026

KEV Added

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Patch

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CVSS Score v3.1 8.0 CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS Score 0.0001 0.3th percentile

Risk Priority 16 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-0204 is a high-severity Missing Authentication for Critical Function (CWE-306) vulnerability in Sonicwall Sonicos. Its CVSS base score is 8.0 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 0.3th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified are NIST 800-53 AC-14 (Permitted Actions Without Identification or Authentication) and AC-3 (Access Enforcement).

Deeper analysis

CVE-2026-0204 is a vulnerability in the access control mechanism of SonicOS, the operating system used in SonicWall firewalls and security appliances. It may allow certain management interface functions to be accessible under specific conditions. The issue is linked to CWE-306 (Missing Authentication for Critical Function) and CWE-1390 (Weak Access Permissions), with a CVSS v3.1 base score of 8.0 (AV:A/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H). The vulnerability was published on 2026-04-29.

The attack scenario requires an attacker with adjacent network access (AV:A) and low complexity (AC:L), needing no privileges (PR:N) but relying on user interaction (UI:R). Successful exploitation enables high-impact effects on confidentiality, integrity, and availability (C:H/I:H/A:H) within the unchanged scope (S:U), potentially granting unauthorized access to sensitive management interface functions.

Mitigation details are provided in the SonicWall PSIRT advisory at https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2026-0004.

EU & UK References

🇪🇺 ENISA EUVD: EUVD-2026-26254

Vulnerability details

A vulnerability in the access control mechanism of SonicOS may allow certain management interface functions to be accessible under specific conditions.

CWE(s): CWE-306 CWE-1390

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access

Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.

attack.mitre.org →

T1133 External Remote Services Persistence

Adversaries may leverage external-facing remote services to initially access and/or persist within a network.

attack.mitre.org →

Why these techniques?

Missing authentication on management interface (CWE-306) directly enables exploitation of the exposed remote management service or application for unauthorized access.

Confidence: MEDIUM · MITRE ATT&CK Enterprise v18.1