Full Report
SonicWall security advisory (AV26-405)
Analysis Summary
# Vulnerability: SonicOS Multiple Vulnerabilities
## CVE Details
- **CVE ID:** CVE-2026-22119 (Primary identifier for associated advisory SNWLID-2026-0004)
- **CVSS Score:** 9.8 (Critical)
- **CWE:** CWE-121 (Stack-based Buffer Overflow) / CWE-78 (OS Command Injection)
## Affected Systems
- **Products:** SonicWall Gen 6, Gen 7 (Hardware & NSv), and Gen 8 Firewalls.
- **Versions:**
- Gen 6 Hardware Firewalls: Firmware version 6.5.5.1-6n and prior.
- Gen 7 NSv: Firmware versions 7.0.1-5169 and prior; 7.3.1-7013 and prior.
- Gen 7 Firewalls: Firmware versions 7.0.1-5169 and prior; 7.3.1-7013 and prior.
- Gen 8 Firewalls: Firmware version 8.1.0-8017 and prior.
- **Configurations:** Systems with management interfaces (HTTP/HTTPS) exposed to the internet or untrusted networks.
## Vulnerability Description
SonicWall SonicOS is affected by multiple vulnerabilities, most significantly a stack-based buffer overflow and improper input validation within the web management interface. An unauthenticated remote attacker can send specially crafted requests to the firewall's management interface, potentially leading to arbitrary code execution (RCE) or a denial-of-service (DoS) condition by crashing the firewall's management service.
## Exploitation
- **Status:** Not exploited (Current reports indicate no active exploitation in the wild at the time of advisory release).
- **Complexity:** Low
- **Attack Vector:** Network
## Impact
- **Confidentiality:** High (Potential for full system compromise)
- **Integrity:** High (Potential for unauthorized configuration changes)
- **Availability:** High (Device crash or persistent DoS)
## Remediation
### Patches
SonicWall recommends upgrading to the following firmware versions or higher:
- **Gen 6:** Upgrade to 6.5.5.1-7n
- **Gen 7:** Upgrade to 7.0.1-5170 or 7.3.1-7014
- **Gen 8:** Upgrade to 8.1.0-8018
### Workarounds
- **Restrict Management Access:** Disable HTTP/HTTPS management access from the WAN. If remote management is required, restrict access to specific, trusted source IP addresses via Access Rules.
- **VPN Access:** Utilize a VPN for administrative access rather than exposing the management portal directly to the internet.
## Detection
- **Indicators of Compromise:** Monitor logs for frequent restarts of the `wcm` (Web Configuration Manager) process or unexpected reboots of the firewall appliance.
- **Detection methods and tools:** Audit web server logs for unusually long or malformed URI requests targeting management ports (default 80/443).
## References
- **Vendor Advisory:** hxxps[://]psirt[.]global[.]sonicwall[.]com/vuln-detail/SNWLID-2026-0004
- **SonicWall Advisory List:** hxxps[://]psirt[.]global[.]sonicwall[.]com/vuln-list
- **Canadian Centre for Cyber Security:** hxxps[://]www[.]cyber[.]gc[.]ca/en/alerts-advisories/sonicwall-security-advisory-av26-405