SonicWall SonicOS null pointer dereference

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
5.7$0-$5k0.00

Summaryinfo

A vulnerability was found in SonicWall SonicOS. It has been classified as problematic. Affected by this vulnerability is an unknown functionality. This manipulation causes null pointer dereference. This vulnerability is handled as CVE-2026-0401. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability has been found in SonicWall SonicOS (unknown version) and classified as critical. Affected by this vulnerability is an unknown code block. The manipulation with an unknown input leads to a null pointer dereference vulnerability. The CWE definition for the vulnerability is CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. As an impact it is known to affect availability. The summary by CVE is:

A post-authentication NULL Pointer Dereference vulnerability in SonicOS allows a remote attacker to crash a firewall.

The weakness was released by Vang3lis as SNWLID-2026-0001. It is possible to read the advisory at psirt.global.sonicwall.com. This vulnerability is known as CVE-2026-0401 since 12/02/2025. The exploitation appears to be easy. The attack can be launched remotely. The technical details are unknown and an exploit is not publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 300077 (SonicWall SonicOS Multiple Post-Authentication Vulnerabilities (SNWLID-2026-0001)), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at Tenable (300077) and CERT Bund (WID-SEC-2026-0495). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Affected

  • SonicWall SonicOS

Productinfo

Type

Vendor

Name

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.7
VulDB Meta Temp Score: 5.7

VulDB Base Score: 6.5
VulDB Temp Score: 6.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

ADP CISA Base Score: 4.9
ADP CISA Vector: 🔒

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock

VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Nessus ID: 300077
Nessus Name: SonicWall SonicOS Multiple Post-Authentication Vulnerabilities (SNWLID-2026-0001)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

12/02/2025 CVE reserved
02/24/2026 +84 days Advisory disclosed
02/24/2026 +0 days VulDB entry created
02/28/2026 +4 days VulDB entry last update

Sourcesinfo

Vendor: sonicwall.com

Advisory: SNWLID-2026-0001
Researcher: Vang3lis
Status: Confirmed

CVE: CVE-2026-0401 (🔒)
GCVE (CVE): GCVE-0-2026-0401
GCVE (VulDB): GCVE-100-347611
CERT Bund: WID-SEC-2026-0495 - SonicWall SonicOS: Mehrere Schwachstellen ermöglichen Denial of Service

Entryinfo

Created: 02/24/2026 17:28
Updated: 02/28/2026 15:46
Changes: 02/24/2026 17:28 (54), 02/24/2026 23:39 (7), 02/28/2026 00:23 (2), 02/28/2026 15:46 (11)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Want to know what is going to be exploited?

We predict KEV entries!