Full Report
The network security device vendor is making a regular appearance on CISA’s known exploited vulnerabilities catalog. Unlike its competitors, SonicWall hasn’t signed the secure-by-design pledge. The post SonicWall customers confront resurgence of actively exploited vulnerabilities appeared first on CyberScoop.
Analysis Summary
# Vulnerability: Chainable Remote Code Execution in SonicWall SMA 100 Appliances
## CVE Details
- CVE ID: CVE-2025-32819, CVE-2025-32820, CVE-2025-32821
- CVSS Score: Information on specific scores/severities for this trio is not provided, but the vulnerabilities allow "remote code execution as root," indicating **Critical** risk when chained.
- CWE: Not explicitly listed, but the chaining implies several flaws, potentially including improper access control/privilege escalation and code execution flaws.
## Affected Systems
- Products: SonicWall SMA 100 appliances
- Versions: All versions of SonicWall SMA 100 appliances are implied to be vulnerable prior to patching. The article notes that this is a legacy series.
- Configurations: Exploitation requires an attacker gaining access to any low-privilege user account first, via CVE-2025-32819, which then allows subsequent exploitation of the other two.
## Vulnerability Description
Three distinct vulnerabilities (CVE-2025-32819, CVE-2025-32820, and CVE-2025-32821) affect SonicWall SMA 100 series appliances. When chained together, they permit an unauthenticated or low-privileged attacker to achieve **Remote Code Execution (RCE) as root**, granting complete control over the device.
The chain works as follows:
1. **CVE-2025-32819** (Exploitable after gaining low-privilege user access): Allows the attacker to delete a key system file and trigger a device reboot.
2. Upon reboot, the device starts with a default administrative username and password.
3. The attacker then leverages **CVE-2025-32820** and **CVE-2025-32821** to establish full control.
## Exploitation
- Status: Rapid7 believes **CVE-2025-32819 may have been exploited in the wild**. There is no confirmed evidence for CVE-2025-32820 and CVE-2025-32821 being exploited currently, but RCE exploit code is publicly available.
- Complexity: Low (Once initial low-privilege access is obtained via CVE-2025-32819).
- Attack Vector: Requires an initial low-privilege user baseline, likely via network access to the SMA device.
## Impact
- Confidentiality: High (Root access grants access to all data on the device).
- Integrity: High (Root access allows complete modification or destruction of system configurations and data).
- Availability: High (Root access allows the attacker to crash or disable the appliance).
## Remediation
### Patches
- SonicWall has released a software update/security advisory containing patches for CVE-2025-32819, CVE-2025-32820, and CVE-2025-32821. Customers must apply the latest patches provided by SonicWall.
### Workarounds
- While specific workarounds are not detailed, SonicWall is promoting the migration away from legacy hardware. Customers should ensure the use of managed firewall/VPN solutions and adhere to best practices. (Note: SonicWall announced End-of-Life for the SMA 100 series in the prior year).
## Detection
- Indicators of Compromise (IOCs): Rapid7 investigations suggest potential private indicators associated with exploitation of CVE-2025-32819.
- Detection methods and tools: Standard endpoint detection and response (EDR) or monitoring tools often lack deep visibility into Linux-based VPN appliances, making proactive monitoring of network traffic and system logs essential, although logging capabilities are generally limited on these devices.
## References
- Vendor Advisory: SonicWall PSIRT advisories (Specific link not provided in context, check official SonicWall PSIRT portal).
- Researcher Disclosure: Rapid7 Blog Post related to vulnerabilities disclosed on May 7, 2025.
- Other Exploited SonicWall CVEs (For Context): CVE-2023-44221, CVE-2021-20035, CVE-2025-23006, CVE-2024-53704.