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CVE-2026-19868

An authentication enforcement vulnerability in SonicOS SSLVPN service may allow a user with valid credentials for an alternate authentication method to bypass SAML authentication controls. Successful exploitation may also bypass SAML-enforced multi-factor authentication (MFA).

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Listed
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Nsa 2700 Nsa 2800 Nsa 3700 and 36 more
CVE-2026-3439

SonicOS Certificate Handling Buffer Overflow Enables Firewall Crash

A post-authentication Stack-based Buffer Overflow vulnerability in SonicOS certificate handling allows a remote attacker to crash a firewall.

CVSS 3.1 · 4.9 Medium EPSS < 1% KEV · Not listed
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Nsa 2700 Nsa 2800 Nsa 3700 and 30 more
CVE-2024-40764

Heap-based buffer overflow vulnerability in the SonicOS IPSec VPN allows an unauthenticated remote attacker to cause Denial of Service (DoS).

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
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Nsa 2700 Nsa 3700 Nsa 4700 and 29 more
CVE-2025-40600

Use of Externally-Controlled Format String vulnerability in the SonicOS SSL VPN interface allows a remote unauthenticated attacker to cause service disruption.

CVSS 3.1 · 9.8 Critical EPSS < 1% KEV · Not listed
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Nsa 2700 Nsa 3700 Nsa 4700 and 20 more
CVE-2025-40601

A Stack-based buffer overflow vulnerability in the SonicOS SSLVPN service allows a remote unauthenticated attacker to cause Denial of Service (DoS), which could cause an impacted firewall to crash.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
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Nsa 2700 Nsa 2800 Nsa 3700 and 30 more
CVE-2026-0399

Authenticated Stack‑Based Buffer Overflow in SonicOS Management API

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

CVSS 3.1 · 4.9 Medium EPSS < 1% KEV · Not listed
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Nsa 2700 Nsa 2800 Nsa 3700 and 30 more
CVE-2026-0400

Post-Authentication Format String Vulnerability Leading to Firewall Crash

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

CVSS 3.1 · 4.9 Medium EPSS < 1% KEV · Not listed
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Nsa 2700 Nsa 2800 Nsa 3700 and 30 more
CVE-2026-0401

Null Pointer Dereference Crash Vulnerability in SonicOS

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

CVSS 3.1 · 4.9 Medium EPSS < 1% KEV · Not listed
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Nsa 2700 Nsa 2800 Nsa 3700 and 30 more
CVE-2026-0402

Post-Authentication Out-of-Bounds Read Leading to Firewall Crash

A post-authentication Out-of-bounds Read vulnerability in SonicOS allows a remote attacker to crash a firewall.

CVSS 3.1 · 4.9 Medium EPSS < 1% KEV · Not listed
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Nsa 2700 Nsa 2800 Nsa 3700 and 30 more
CVE-2022-22278

A vulnerability in SonicOS CFS (Content filtering service) returns a large 403 forbidden HTTP response message to the source address when users try to access prohibited resource this allows an attacker to cause HTTP Denial of Service (DoS) attack

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
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CVE-2023-1101

SonicOS SSLVPN improper restriction of excessive MFA attempts vulnerability allows an authenticated attacker to use excessive MFA codes.

CVSS 3.1 · 8.8 High EPSS < 1% KEV · Not listed
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Nsa 2600 Nsa 2650 Nsa 2700 and 65 more
CVE-2024-22394

An improper authentication vulnerability has been identified in SonicWall SonicOS SSL-VPN feature, which in specific conditions could allow a remote attacker to bypass authentication.  This issue affects only firmware version SonicOS 7.1.1-7040.

CVSS 3.1 · 9.8 Critical EPSS < 1% KEV · Not listed
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Nsa 2700 Nsa 3700 Nsa 4700 and 19 more
CVE-2024-29012

Stack-based buffer overflow vulnerability in the SonicOS HTTP server allows an authenticated remote attacker to cause Denial of Service (DoS) via sscanf function.

CVSS 3.1 · 4.9 Medium EPSS < 1% KEV · Not listed
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Nsa 2700 Nsa 3700 Nsa 4700 and 19 more
CVE-2024-29013

Heap-based buffer overflow vulnerability in the SonicOS SSL-VPN allows an authenticated remote attacker to cause Denial of Service (DoS) via memcpy function.

CVSS 3.1 · 5.3 Medium EPSS < 1% KEV · Not listed
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Nsa 2700 Nsa 3700 Nsa 4700 and 19 more
CVE-2026-0206

Post‑Authentication Buffer Overflow in SonicOS Causes Firewall Crash

A post-authentication Stack-based Buffer Overflow vulnerabilities in SonicOS allows a remote attacker to crash a firewall.

CVSS 3.1 · 4.9 Medium EPSS < 1% KEV · Not listed
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Nsa 2650 Nsa 2700 Nsa 2800 and 61 more
CVE-2023-0656

A Stack-based buffer overflow vulnerability in the SonicOS allows a remote unauthenticated attacker to cause Denial of Service (DoS), which could cause an impacted firewall to crash.

CVSS 3.1 · 7.5 High EPSS 41.3% KEV · Not listed
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Nsa 2700 Nsa 3700 Nsa 4700 and 29 more
CVE-2024-53704

An Improper Authentication vulnerability in the SSLVPN authentication mechanism allows a remote attacker to bypass authentication.

CVSS 3.1 · 8.2 High EPSS 95.3% KEV · Listed
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Nsa 2700 Nsa 3700 Nsa 4700 and 21 more
CVE-2021-20031

A Host Header Redirection vulnerability in SonicOS potentially allows a remote attacker to redirect firewall management users to arbitrary web domains.

CVSS 3.1 · 6.1 Medium EPSS 13.0% KEV · Not listed
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Nsa 2650 Nsa 2700 Nsa 3650 and 56 more
CVE-2021-20027

A buffer overflow vulnerability in SonicOS allows a remote attacker to cause a Denial of Service (DoS) by sending a specially crafted request. This vulnerability affects SonicOS Gen5, Gen6, Gen7 platforms, and SonicOSv virtual firewalls.

CVSS 3.1 · 7.5 High EPSS 1.3% KEV · Not listed
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Nsa 2650 Nsa 2700 Nsa 3650 and 56 more
CVE-2026-0204

Access Control Bypass in SonicOS Management Functions

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

CVSS 3.1 · 8 High EPSS < 1% KEV · Not listed
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Nsa 2650 Nsa 2700 Nsa 2800 and 61 more