Cyber Resilience

CVE-2025-40600

Sonicwall Sonicos 7.1.1-7040 – 7.3.0-7012

Published
29 July 2025
Modified
17 June 2026
Patch / advisory
View advisory
CVSS Score v3.1 9.8
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS Score 0.0088 56th percentile
Risk Priority 73 floored blend · peak EPSS

Summary

CVE-2025-40600 is a critical-severity Use of Externally-Controlled Format String (CWE-134) vulnerability in Sonicwall Sonicos. Its CVSS base score is 9.8 (Critical).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation for Privilege Escalation (T1068); ranked in the top 44% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified map to SA-11 (Developer Testing and Evaluation) and SI-10 (Information Input Validation) — see the control section below for these in your framework.

Deeper analysis AI-assisted summary

Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.

CVE-2025-40600 is a Use of Externally-Controlled Format String vulnerability (CWE-134) present in the SonicOS SSL VPN interface of SonicWall SonicOS devices. Published on 2025-07-29, it has been assigned a CVSS v3.1 base score of 9.8 (Critical), reflecting its network accessibility (AV:N), low attack complexity (AC:L), lack of required privileges (PR:N), and absence of user interaction (UI:N), with high impacts across confidentiality (C:H), integrity (I:H), and availability (A:H) and no change in scope (S:U).

A remote unauthenticated attacker can exploit this vulnerability to cause service disruption on affected SonicOS SSL VPN interfaces. The attack requires no authentication or privileges and can be executed over the network with low complexity and no user interaction, potentially leading to high-severity impacts including data exposure, modification, and denial of service.

SonicWall has published a corresponding advisory under identifier SNWLID-2025-0013, available at https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2025-0013, which security practitioners should consult for details on patches, workarounds, and mitigation recommendations.

EU & UK References

Vulnerability Data

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

CWE(s)
CWE-134

Related Threats

MITRE ATT&CK Enterprise Techniques

T1068 Exploitation for Privilege Escalation Privilege Escalation
Adversaries may exploit software vulnerabilities in an attempt to elevate privileges.
attack.mitre.org →
T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
T1203 Exploitation for Client Execution Execution
Adversaries may exploit software vulnerabilities in client applications to execute code.
attack.mitre.org →
T1212 Exploitation for Credential Access Credential Access
Adversaries may exploit software vulnerabilities in an attempt to collect credentials.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2026-0400Same product: Sonicwall Nsa 2700
CVE-2026-0399Same product: Sonicwall Nsa 2700
CVE-2025-40601Same product: Sonicwall Nsa 2700
CVE-2026-3439Same product: Sonicwall Nsa 2700
CVE-2026-0402Same product: Sonicwall Nsa 2700
CVE-2024-29012Same product: Sonicwall Nsa 2700
CVE-2024-29013Same product: Sonicwall Nsa 2700
CVE-2023-0656Same product: Sonicwall Nsa 2700
CVE-2024-40764Same product: Sonicwall Nsa 2700
CVE-2022-22274Same product: Sonicwall Nsa 2700

Affected Assets

sonicwall
sonicos
7.1.1-7040 — 7.3.0-7012

Mitigating Controls

Mitigating Controls (NIST 800-53 r5) AI

SA-11 Developer Testing and Evaluation good match

Developer testing and static analysis can discover format-string vulnerabilities before deployment.

SI-10 Information Input Validation good match

Input validation can reject or sanitize externally supplied format strings before they reach formatting functions.

SA-15 Development Process, Standards, and Tools partial match

Secure development standards and tools can mandate use of static format strings or safe formatting APIs.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 mostly match
prevents

Secure SDLC practices directly prevent external format strings via code review, static analysis, and safe APIs.

ID.RA-01 partial match
prevents

Vulnerability identification can discover existing format-string flaws but does not prevent their introduction.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.29 Security testing in development and acceptance mostly match
finds

Security testing in development can detect format-string vulnerabilities before release.

A.8.25 Secure development life cycle partial match
prevents

Secure SDLC mandates input validation and safe API usage that can prevent externally-controlled format strings.

A.8.26 Application security requirements partial match
prevents

Application security requirements can specify safe formatting functions and ban uncontrolled format strings.

A.8.27 Secure system architecture and engineering principles partial match
prevents

Secure architecture principles discourage dangerous string-handling patterns that lead to format-string issues.

A.8.28 Secure coding partial match
prevents

Secure coding standards directly forbid the use of untrusted format strings and prescribe safe alternatives.

References