Unauthenticated firewall crash via SSLVPN stack overflow
Published Nov 20, 2025 · Updated Nov 20, 2025
Stack-based buffer overflow in SonicWall SonicOS 7.3.0-7012 and earlier and 8.0.2-8011 and earlier allows remote attackers to crash firewalls. The SSLVPN service writes attacker-controlled input beyond a stack buffer, corrupting stack memory until the firewall process or device fails. The SSLVPN service must be enabled and remotely reachable; no authentication or user interaction is required, and the reported consequence is a crash.
Summary
What happened
Stack-based buffer overflow in SonicWall SonicOS 7.3.0-7012 and earlier and 8.0.2-8011 and earlier allows remote attackers to crash firewalls. The SSLVPN service writes attacker-controlled input beyond a stack buffer, corrupting stack memory until the firewall process or device fails. The SSLVPN service must be enabled and remotely reachable; no authentication or user interaction is required, and the reported consequence is a crash.
The record
- CVE
- CVE-2025-40601
- Published
- Nov 20, 2025
- Updated
- Nov 20, 2025
- Vendor
- SonicWall
- Product
- SonicOS
- Classifications
- CWE-121, T1499
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Nov 20, 2025CVE publishedPublication date reported by the CVE source.
- Nov 20, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=7.3.0-7012 and older versions
- Affected versionversion=8.0.2-8011 and older versions
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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