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CVE-2025-40596 is a high-severity stack-based buffer overflow in the web management interface of SonicWall SMA 100 Series appliances, including SMA 210, SMA 410, and SMA 500v. The flaw is present in the appliance's httpd process, which handles incoming web requests, and is reachable prior to authentication. Available reporting indicates the vulnerability is caused by incorrect use of the sscanf function while parsing parts of a web address, allowing a malformed request to overwrite stack memory. A successful trigger can crash the service and may, under favorable conditions, permit code execution.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
23 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability in SonicWall SMA 100 Series appliances that could allow denial-of-service or code execution via pre-auth stack and heap overflows.
A specific vulnerability in SonicWall SMA100 referenced as part of a set of memory corruption issues (stack/heap overflow context implied by the segment title).
A pre-authentication stack-based buffer overflow in the httpd component of SonicWall SMA100 series SSL-VPN appliances that could lead to denial of service or potentially remote code execution.
A stack-based buffer overflow vulnerability in the SonicWall SMA 100 Series web interface that may allow a remote unauthenticated attacker to cause denial of service or potentially achieve code execution.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.