SonicWall SonicOS format string

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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5.7$0-$5k0.00

Summaryinfo

A vulnerability was found in SonicWall SonicOS and classified as critical. Affected is an unknown function. The manipulation results in format string. This vulnerability is known as CVE-2026-0400. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability, which was classified as critical, was found in SonicWall SonicOS (the affected version is unknown). Affected is an unknown code. The manipulation with an unknown input leads to a format string vulnerability. CWE is classifying the issue as CWE-134. The product uses a function that accepts a format string as an argument, but the format string originates from an external source. This is going to have an impact on availability. CVE summarizes:

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

The weakness was published by Vang3lis and Heuzoo as SNWLID-2026-0001. The advisory is available at psirt.global.sonicwall.com. This vulnerability is traded as CVE-2026-0400 since 12/02/2025. The exploitability is told to be easy. It is possible to launch the attack remotely. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 02/28/2026).

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). If you want to get best quality of vulnerability data, you may have to visit VulDB.

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

Exploitinginfo

Class: Format string
CWE: CWE-134 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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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, Heuzoo
Status: Confirmed

CVE: CVE-2026-0400 (🔒)
GCVE (CVE): GCVE-0-2026-0400
GCVE (VulDB): GCVE-100-347610
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

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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