Assessment
Why it matters
CISA lists this vulnerability as known to be exploited; exploitation is confirmed; EPSS is 99.9%; technical severity is CVSS 9.8.
A Stack-based buffer overflow vulnerability in SMA100 Apache httpd server's mod_cgi module environment variables allows a remote unauthenticated attacker to potentially execute code as a 'nobody' user in the appliance. This vulnerability affected SMA 200, 210, 400, 410 and 500v appliances firmware 10.2.0.8-37sv, 10.2.1.1-19sv, 10.2.1.2-24sv and earlier versions.
Who should care
- Teams operating SMA 100 Appliances, Sma 200 Firmware, Sma 210 Firmware +3 more
- Vulnerability and exposure management teams
- Security operations teams monitoring exploitation activity
Response plan
What I would do
- Confirm whether SMA 100 Appliances, Sma 200 Firmware, Sma 210 Firmware +3 more is present in the environment.
- Identify affected versions and establish whether vulnerable services are exposed or reachable.
- Apply updates per vendor instructions.
- Review relevant security telemetry for evidence of attempted or successful exploitation.
- Document the remediation decision and track it to verified completion.
Vendor remediation
Patch and remediation links
Use the vendor source below to confirm the correct fixed version, package or mitigation for your affected product.
Technical details
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CWE
- CWE-121
- Affected versions
- Sonicwall SMA 100 Appliances; Sonicwall Sma 200 Firmware (Version: 10.2.1.2-24sv); Sonicwall Sma 210 Firmware (Version: 10.2.1.2-24sv); Sonicwall Sma 400 Firmware (Version: 10.2.1.2-24sv); Sonicwall Sma 410 Firmware (Version: 10.2.1.2-24sv); Sonicwall Sma 500v Firmware (Version: 10.2.1.2-24sv)
- Published
- 8 December 2021
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
Signal timeline
- CVE published
- Added to CISA KEV
- Latest EPSS score: 99.9%
- Signal calculated at 88