CVE-2021-20038 KEV
9.8
CRITICAL · CVSS 3.1 · EPSS 99.9% (pctl 100)
Patch first
On CISA KEV — known exploited in the wild, due 2022-02-11.
Description
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.
Scoring
| CVSS | 9.8 (CRITICAL, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 99.91% — more likely to be exploited than 100% of all CVEs |
| Weakness | CWE-121 |
| On CISA KEV | yes — remediate by 2022-02-11 |
| Public exploit | none known |
| Published | 2021-12-08 |
| Last modified | 2026-06-17 |
CISA KEV
| Name | SonicWall SMA 100 Appliances Stack-Based Buffer Overflow Vulnerability |
|---|---|
| Added | 2022-01-28 |
| Due | 2022-02-11 |
| Vendor / product | SonicWall / SMA 100 Appliances |
| Ransomware use | known |
Affected (10)
| Vendor | Product |
|---|---|
| sonicwall | sma 200 |
| sonicwall | sma 200 firmware |
| sonicwall | sma 210 |
| sonicwall | sma 210 firmware |
| sonicwall | sma 400 |
| sonicwall | sma 400 firmware |
| sonicwall | sma 410 |
| sonicwall | sma 410 firmware |
| sonicwall | sma 500v |
| sonicwall | sma 500v firmware |
References
- https://github.com/jbaines-r7/badblood
- 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-vulnerabilities-fixed-2/
- https://github.com/jbaines-r7/badblood
- 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-vulnerabilities-fixed-2/
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-20038
→ the Explorer · watch your stack · NVD