SonicWall SonicOS API Endpoint stack-based overflow

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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7.4$0-$5k0.00

Summaryinfo

A vulnerability was found in SonicWall SonicOS. It has been rated as critical. This affects an unknown part of the component API Endpoint. Performing a manipulation results in stack-based overflow. This vulnerability was named CVE-2026-0399. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability was found in SonicWall SonicOS (version unknown). It has been classified as very critical. This affects an unknown function of the component API Endpoint. The manipulation with an unknown input leads to a stack-based overflow vulnerability. CWE is classifying the issue as CWE-121. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Multiple post-authentication stack-based buffer overflow vulnerabilities in the SonicOS management interface due to improper bounds checking in a API endpoint.

The weakness was presented by Vang3lis, Heuzoo and Moyushui as SNWLID-2026-0001. The advisory is shared at psirt.global.sonicwall.com. This vulnerability is uniquely identified as CVE-2026-0399 since 12/02/2025. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Neither technical details nor an exploit are publicly available. The price for an exploit might be around 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 the best quality for vulnerability data then you always have to consider 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: 7.4
VulDB Meta Temp Score: 7.4

VulDB Base Score: 9.8
VulDB Temp Score: 9.8
VulDB Vector: 🔒
VulDB Reliability: 🔍

ADP CISA Base Score: 4.9
ADP CISA Vector: 🔒

CVSSv2info

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

Exploitinginfo

Class: Stack-based overflow
CWE: CWE-121 / 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, Moyushui
Status: Confirmed

CVE: CVE-2026-0399 (🔒)
GCVE (CVE): GCVE-0-2026-0399
GCVE (VulDB): GCVE-100-347613
CERT Bund: WID-SEC-2026-0495 - SonicWall SonicOS: Mehrere Schwachstellen ermöglichen Denial of Service

Entryinfo

Created: 02/24/2026 17:29
Updated: 02/28/2026 15:46
Changes: 02/24/2026 17:29 (55), 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 the best quality for vulnerability data then you always have to consider VulDB.

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