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SonicWall has revealed a vulnerability in its SonicOS SSLVPN Virtual Office interface that could let remote attackers crash firewall appliances. Identified as CVE-2025-32818, this high-severity vulnerability has a CVSS score of 7.5, posing significant risks for enterprises using SonicWall Gen7 devices for secure network access.
The official advisory states that a Null Pointer Dereference vulnerability in the SonicOS SSLVPN Virtual Office interface lets a remote, unauthenticated attacker crash the firewall, which could cause a Denial-of-Service (DoS) situation.
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This flaw allows attackers to take the firewall offline by sending specific requests to the SSLVPN interface, without needing authentication.
The vulnerability affects a wide range of SonicWall’s Gen7 virtual and physical firewalls, including:
Gen7 NSv: NSv 270, NSv 470, NSv 870
Gen7 Firewalls: TZ270, TZ270W, TZ370, TZ370W, TZ470, TZ470W, TZ570, TZ570W, TZ570P, TZ670
NSa Series: NSa 2700, 3700, 4700, 5700, 6700
NSsp Series: 10700, 11700, 13700, 15700
TZ80 (firmware 8.0.0-8037 and earlier)
Affected versions range from 7.1.1-7040 to 7.1.3-7015 (for 7.1.x releases) and 8.0.0-8037 and earlier for the TZ80.
SonicWall has quickly resolved this issue in recent firmware updates. Users should upgrade to:
Version 7.2.0-7015 or higher for Gen7 Firewalls and NSv
Version 8.0.1-8017 or higher for TZ80 devices
Enterprises are advised to implement these updates right away to reduce the risk of a DoS attack.
