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Vulnerability record · CVE-2025-40601 · published 20 November 2025

CVE-2025-40601: Sonicwall sonicos stack-based buffer overflow vulnerability

Sonicwall · Sonicos

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.

7.5 CVSS 3.1 High EPSS 1.2% · top 33.6% CWE-121 · Stack-based buffer overflow
7.5CVSS 3.1 base score
1.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
1References
17 Jun 2026Last modified by NVD

Description

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/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2025-0016 Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2024-53704SonicWall SonicOS SSLVPN authentication bypassSonicOS SSLVPN authentication contains an improper authentication flaw (CWE-287) that lets a remote attacker bypass authentication entirely. With a C…KEVEPSS 95%analysed9.8CVE-2024-40766SonicWall SonicOS improper access control in management accessSonicOS management access contains an improper access control flaw that can allow unauthorized resource access and, under specific conditions, crash …KEVEPSS 18%analysed9.8CVE-2020-5135SonicWall SonicOS buffer overflow in firewall request handlingSonicOS contains a classic buffer overflow (CWE-120) reachable by sending a malicious request to the firewall. It affects SonicOS Gen 6 versions 6.5.…KEVEPSS 27%analysed9.8CVE-2025-40600Sonicwall sonicos vulnerabilityUse of Externally-Controlled Format String vulnerability in the SonicOS SSL VPN interface allows a remote unauthenticated attacker to cause service d…EPSS 0.91%9.8CVE-2024-22394Sonicwall sonicos improper authentication vulnerabilityAn improper authentication vulnerability has been identified in SonicWall SonicOS SSL-VPN feature, which in specific conditions could allow a remote …EPSS 0.75%9.8CVE-2022-22274SonicOS HTTP request stack buffer overflowSonicOS and SonicOSv contain a stack-based buffer overflow reachable through an HTTP request. A remote unauthenticated attacker can trigger it to cra…EPSS 76%analysed9.8CVE-2019-12260Windriver vxworks classic buffer overflow vulnerabilityWind River VxWorks 6.9 and vx7 has a Buffer Overflow in the TCP component (issue 2 of 4). This is an IPNET security vulnerability: TCP Urgent Pointer…EPSS 23%9.8CVE-2019-12261Windriver vxworks classic buffer overflow vulnerabilityWind River VxWorks 6.7 though 6.9 and vx7 has a Buffer Overflow in the TCP component (issue 3 of 4). This is an IPNET security vulnerability: TCP Urg…EPSS 9.0%

Source: NIST National Vulnerability Database (record CVE-2025-40601), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.