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Critical

Predictable SSLVPN Authentication Token in SonicWall SonicOS

IdentifiersCVE-2024-40762CWE-338· Use of Cryptographically Weak…

CVE-2024-40762 is a vulnerability in SonicWall SonicOS affecting the SSLVPN authentication token generator. The issue is caused by use of a cryptographically weak pseudo-random number generator (PRNG), which can make system-generated authentication or cryptographic tokens predictable in certain cases. If an attacker can predict these SSLVPN authentication tokens, the attacker may be able to bypass authentication without possessing valid credentials. The available content identifies this specifically as a weakness in SonicOS SSLVPN authentication token generation and characterizes the flaw as an authentication bypass condition stemming from predictable token generation.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation can allow an attacker to predict SSLVPN authentication tokens and bypass authentication on affected SonicWall devices. This can provide unauthorized access to the SSLVPN service and, depending on the victim environment and exposed administrative or internal access paths behind the VPN, may enable further compromise of protected network resources. The provided content does not specify broader post-authentication actions beyond authentication bypass.

Mitigation

If you can’t patch tonight, do this now.

If immediate patching is not possible, disable Internet-facing SSLVPN service. Where disabling SSLVPN is not operationally feasible, restrict SSLVPN access to trusted source addresses only. Review Internet-exposed devices running vulnerable SonicOS versions for signs of compromise, including suspicious local-user login attempts and other anomalous access-log entries.

Remediation

Patch, then assume compromise.

Apply SonicWall vendor-provided software updates that address CVE-2024-40762. The supplied content states that SonicWall released software updates for affected products and urges users to update immediately to the latest vendor-provided software version.
PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

ACTIVITY FEED

Recent activity

4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

4 SOURCESView more in app
What this page doesn’t show

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Exposure mapping

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Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity

Community discussion across Reddit, Mastodon, and other social sources.

EXTERNAL REFERENCES
MITRE CVE
cve.org · CVE-2024-40762
NVD
nvd.nist.gov/vuln/detail/CVE-2024-40762
MITRE CWE · CWE-338
Use of Cryptographically Weak Pseudo-Random…
psirt.global.sonicwall.com
psirt.global.sonicwall.com/vuln-detail/SNWLID-2025-0003