// For flags

CVE-2024-40762

SonicWALL NSv Cryptographically Weak PRNG Authentication Bypass Vulnerability

Severity Score

9.8
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Attend
*SSVC
Descriptions

Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG) in the SonicOS SSLVPN authentication token generator that, in certain cases, can be predicted by an attacker potentially resulting in authentication bypass.

This vulnerability allows remote attackers to bypass authentication on affected installations of SonicWALL NSv. Authentication is not required to exploit this vulnerability.
The specific flaw exists within the generation of cookies. The issue results from the use of a cryptographically weak pseudo-random number generator. An attacker can leverage this vulnerability to bypass authentication on the system.

*Credits: Daan Keuper, Thijs Alkemade and Khaled Nassar of Computest Security through Trend Micro (Zero Day Initiative),Daan Keuper, Thijs Alkemade and Khaled Nassar of Computest Security
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Attack Vector
Network
Attack Complexity
Low
Authentication
None
Confidentiality
Partial
Integrity
Partial
Availability
Partial
* Common Vulnerability Scoring System
SSVC
  • Decision:Attend
Exploitation
None
Automatable
Yes
Tech. Impact
Total
* Organization's Worst-case Scenario
Timeline
  • 2024-07-10 CVE Reserved
  • 2025-01-09 CVE Published
  • 2025-01-09 CVE Updated
  • 2025-06-19 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-338: Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)
CAPEC
References (1)
URL Tag Source
URL Date SRC
URL Date SRC
URL Date SRC
https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2025-0003 2025-01-09
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Sonicwall
Search vendor "Sonicwall"
 Sonicos
Search vendor "Sonicwall" for product "Sonicos"
*-
Affected