CVE-2021-20038
KEV RANSOMWARECRITICAL 9.8EPSS 99.9%
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.
- Affected
- SonicWall · SonicWall SMA100
- CVSS v3.1 NVD
- 9.8 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - CVSS v2.0 NVD
- 7.5 HIGH
AV:N/AC:L/Au:N/C:P/I:P/A:P - EPSS
- 99.91% chance of exploitation in the next 30 days, 100th percentile
- CISA KEV
- added 2022-01-28, used in ransomware campaigns
- Nuclei
- critical
- Published
- 2021-12-08
- Updated
- 2025-10-21
Proof-of-concept exploits (2)
- jbaines-r7/badblood95★ · 2022-01-11
- vesperp/CVE-2021-20038-SonicWall-RCE1★ · 2022-08-08
Nuclei templates (1)
Metasploit modules (1)
Security advisories
- https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0026
- https://www.rapid7.com/blog/post/2022/01/11/cve-2021-20038-42-sonicwall-sma-100-multiple-…