December 17, 2025

4 Min Read

A zero-day vulnerability in SonicWall’s Secure Mobile Access (SMA) 1000 was reportedly exploited in the wild in a chained attack with CVE-2025-23006.

Background

On December 17, SonicWall published a security advisory (SNWLID-2025-0019) for a newly disclosed vulnerability in its Secure Mobile Access (SMA) 1000 product, a remote access solution.

Analysis

CVE-2025-40602 is a local privilege escalation vulnerability in the appliance management console (AMC) of the SonicWall SMA 1000 appliance. An authenticated, remote attacker could exploit this vulnerability to escalate privileges on an affected device. While on its own, this flaw would require authentication in order to exploit, the advisory from SonicWall states that CVE-2025-40602 has been exploited in a chained attack with CVE-2025-23006, a deserialization of untrusted data vulnerability patched in January. The combination of these two vulnerabilities would allow an unauthenticated attacker to execute arbitrary code with root privileges.

According to SonicWall, “SonicWall Firewall products are not affected by this vulnerability.”

Historical exploitation of SonicWall vulnerabilities

SonicWall products have been a frequent target for attackers over the years. Specifically, the SMA product line has been targeted in the past by ransomware groups, as well as being featured in the Top Routinely Exploited Vulnerabilities list co-authored by multiple United States and International Agencies.

Earlier this year, an increase in ransomware activity tied to SonicWall Gen 7 Firewalls was observed. While initially it was believed that a new zero-day may have been the root cause, SonicWall later provided a statement noting that exploitation activity was in relation to CVE-2024-40766, an improper access control vulnerability which had been observed to have been exploited in the wild. More information on this can be found on our blog.

Given the past exploitation of SonicWall devices, we put together the following list of known SMA vulnerabilities that have been exploited in the wild:

Proof of concept

At the time this blog was published, no proof-of-concept (PoC) code had been published for CVE-2025-40602. If and when a public PoC exploit becomes available for CVE-2025-40602, we anticipate a variety of attackers will attempt to leverage this flaw as part of their attacks.

Solution

SonicWall has released patches to address this vulnerability as outlined in the table below:

The advisory also provides a workaround to reduce potential impact. This involves restricting access to the AMC to trusted sources. We recommend reviewing the advisory for the most up to date information on patches and workaround steps.

Identifying affected systems

A list of Tenable plugins for this vulnerability can be found on the individual CVE page for CVE-2025-40602 as they’re released. This link will display all available plugins for this vulnerability, including upcoming plugins in our Plugins Pipeline. In addition, product coverage for CVE-2025-23006 can be found here.

Tenable Attack Surface Management customers are able to identify these assets using a filtered search for SonicWall devices:

Get more information

• SonicWall SNWLID-2025-0019 Security Advisory
• Tenable Blog: CVE-2025-23006: SonicWall Secure Mobile Access (SMA) 1000 Zero-Day Reportedly Exploited

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