Resecurity reports that the INC ransomware operation has become the dominant group exploiting two SonicWall SMA1000 VPN appliance flaws, accelerating its attacks since early August. The pair, CVE-2026-15409 and CVE-2026-15410, were exploited as zero-days before SonicWall patched them in mid-July, and can be chained to gain root on the appliance and extract credentials, session databases, and one-time-password data. Many appliances remain unpatched or already compromised, leaving footholds attackers can reuse. Victims listed recently span private and government organizations across several countries, and some reported follow-up emails and phone calls from people claiming to help with the ransomware.
Incident response firm Volexity detailed how attackers chained two SonicWall SMA1000 flaws as zero-days weeks before the vendor disclosed them, reaching root and installing malware built specifically for the appliances. A previously unknown actor it tracks as UTA0533 began exploiting on June 22, nearly three weeks before the July 14 advisory. The chain starts with CVE-2026-15409 against the /wsproxy endpoint, letting an unauthenticated attacker open WebSocket tunnels to services meant to be reachable only from the appliance itself, then uses CVE-2026-15410 for command execution. With root, the actor could read stored credentials, capture traffic, and intercept credentials the appliance processes.
SonicWall is warning that two flaws in its SMA1000 remote-access appliances are being actively exploited as zero-days, and has released hotfixes. CVE-2026-15409 is an unauthenticated server-side request forgery bug in the appliance's WorkPlace interface that lets an attacker make the device send requests to internal systems, turning an edge gateway into a pivot point. CVE-2026-15410 is a code-injection flaw in the management console that lets an administrator run operating-system commands, and SonicWall rates the overall advisory a top CVSS score of 10.0. Both were added to CISA's exploited-vulnerabilities catalog, with a federal deadline of July 17. Because exploitation is confirmed, any unpatched appliance should be treated as potentially compromised.
ReliaQuest has documented active in-the-wild exploitation of CVE-2024-12802, a SonicWall Gen6 SSL-VPN MFA bypass that hits Gen6 devices even after they apply the firmware patch. SonicWall's advisory makes clear that on Gen6 hardware, the firmware update alone does not fix it - administrators must also delete the LDAP configuration that uses userPrincipalName, remove cached LDAP users, drop the SSL VPN User Domain back to LocalDomain, reboot, and rebuild the LDAP config without userPrincipalName. Gen7 and Gen8 devices are patched by firmware alone. Intrusions observed between February and March 2026 looked like ransomware initial-access broker activity with 30-60 minute Cobalt Strike and BYOVD attempts.
SonicWall released emergency firmware updates for Gen 6, Gen 7, and Gen 8 firewalls after CrowdStrike's research team disclosed three SonicOS flaws on April 29. The worst is CVE-2026-0204 (CVSS 8.0), a weak authentication bug in the management interface that lets an attacker on an adjacent network reach management functions without logging in - and from there change firewall rules, disable security protections, or open new holes. The other two are post-authentication: CVE-2026-0205 is a path traversal that breaks out of restricted directories, and CVE-2026-0206 is a buffer overflow that crashes the firewall. No public exploits yet.
TrustStrike Labs