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CVE-2021-20038
CRITICALCISA KEV9.8
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.
CVE Details
CVSS v3.1 Score9.8
SeverityCRITICAL
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack VectorNETWORK
ComplexityLOW
Privileges RequiredNONE
User InteractionNONE
Published12/8/2021
Last Modified10/31/2025
Sourcekev
Honeypot Sightings0
CISA KEV
VendorSonicWall
ProductSMA 100 Appliances
Vulnerability NameSonicWall SMA 100 Appliances Stack-Based Buffer Overflow Vulnerability
KEV Date Added2022-01-28
Remediation Due Date2022-02-11
Ransomware UseKnown
Affected Products
sonicwall:sma_200sonicwall:sma_200_firmwaresonicwall:sma_210sonicwall:sma_210_firmwaresonicwall:sma_400sonicwall:sma_400_firmwaresonicwall:sma_410sonicwall:sma_410_firmwaresonicwall:sma_500vsonicwall:sma_500v_firmware
Weaknesses (CWE)
CWE-121CWE-787
References
https://github.com/jbaines-r7/badblood(PSIRT@sonicwall.com)
https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0026(PSIRT@sonicwall.com)
https://www.rapid7.com/blog/post/2022/01/11/cve-2021-20038-42-sonicwall-sma-100-multiple-vulnerabilities-fixed-2/(PSIRT@sonicwall.com)
https://github.com/jbaines-r7/badblood(af854a3a-2127-422b-91ae-364da2661108)
https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0026(af854a3a-2127-422b-91ae-364da2661108)
https://www.rapid7.com/blog/post/2022/01/11/cve-2021-20038-42-sonicwall-sma-100-multiple-vulnerabilities-fixed-2/(af854a3a-2127-422b-91ae-364da2661108)
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-20038(134c704f-9b21-4f2e-91b3-4a467353bcc0)
IOC Correlations
No correlations recorded
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