SonicWall SMA1000 Tunnel TOTP Authentication unicode encoding

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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6.3$0-$5k0.00

Summaryinfo

A vulnerability categorized as critical has been discovered in SonicWall SMA1000. Affected by this issue is some unknown functionality of the component Tunnel TOTP Authentication. Such manipulation leads to improper handling of unicode encoding. This vulnerability is listed as CVE-2026-4116. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability was found in SonicWall SMA1000 (affected version unknown). It has been rated as critical. Affected by this issue is an unknown functionality of the component Tunnel TOTP Authentication. The manipulation with an unknown input leads to a improper handling of unicode encoding vulnerability. Using CWE to declare the problem leads to CWE-176. The product does not properly handle when an input contains Unicode encoding. Impacted is confidentiality, integrity, and availability. CVE summarizes:

Improper handling of Unicode encoding in SonicWall SMA1000 series appliances allows a remote authenticated SSLVPN user to bypass Workplace/Connect Tunnel TOTP authentication.

The advisory is shared for download at psirt.global.sonicwall.com. This vulnerability is handled as CVE-2026-4116 since 03/13/2026. The exploitation is known to be easy. The attack may be launched remotely. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 04/11/2026).

The vulnerability scanner Nessus provides a plugin with the ID 305940 (SonicWall SMA 1000 Series <= 12.4.3-03245 / 12.5.x <= 12.5.0-02283 Multiple Vulnerabilities (SNWLID-2026-0003)), 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 (305940) and EUVD (EUVD-2026-20908). Once again VulDB remains the best source for vulnerability data.

Productinfo

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Vendor

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 6.3

VulDB Base Score: 6.3
VulDB Temp Score: 6.3
VulDB Vector: 🔒
VulDB Reliability: 🔍

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: Improper handling of unicode encoding
CWE: CWE-176 / CWE-172
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: 305940
Nessus Name: SonicWall SMA 1000 Series <= 12.4.3-03245 / 12.5.x <= 12.5.0-02283 Multiple Vulnerabilities (SNWLID-2026-0003)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

03/13/2026 CVE reserved
04/09/2026 +26 days Advisory disclosed
04/09/2026 +0 days VulDB entry created
04/11/2026 +1 days VulDB entry last update

Sourcesinfo

Vendor: sonicwall.com

Advisory: SNWLID-2026-0003
Status: Confirmed

CVE: CVE-2026-4116 (🔒)
GCVE (CVE): GCVE-0-2026-4116
GCVE (VulDB): GCVE-100-356588
EUVD: 🔒

Entryinfo

Created: 04/09/2026 17:37
Updated: 04/11/2026 01:02
Changes: 04/09/2026 17:37 (53), 04/09/2026 18:41 (1), 04/11/2026 01:02 (2)
Complete: 🔍
Cache ID: 216:1E9:103

Once again VulDB remains the best source for vulnerability data.

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