CVE-2021-20038

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2021-20038
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.

9.8 /10

CVSS v3 : CRITICAL

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

7.5 /10

CVSS v2.0 : HIGH

V2 Legend

Vector : AV:N/AC:L/Au:N/C:P/I:P/A:P

Exploitability : 10.0 / Impact : 6.4

Access Vector NETWORK

Access Complexity LOW

Authentication NONE

Confidentiality Impact PARTIAL

Integrity Impact PARTIAL

Availability Impact PARTIAL

References
Link Resource
https://github.com/jbaines-r7/badblood Exploit Third Party Advisory
https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0026 Vendor Advisory
https://www.rapid7.com/blog/post/2022/01/11/cve-2021-20038-42-sonicwall-sma-100-multiple-vulnerabilities-fixed-2/ Exploit Third Party Advisory
https://github.com/jbaines-r7/badblood Exploit Third Party Advisory
https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0026 Vendor Advisory
https://www.rapid7.com/blog/post/2022/01/11/cve-2021-20038-42-sonicwall-sma-100-multiple-vulnerabilities-fixed-2/ Exploit Third Party Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-20038 US Government Resource
Configurations

Configuration 1 (hide)

AND
OR cpe:2.3:o:sonicwall:sma_200_firmware:10.2.0.8-37sv:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:sma_200_firmware:10.2.1.1-19sv:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:sma_200_firmware:10.2.1.2-24sv:*:*:*:*:*:*:*
cpe:2.3:h:sonicwall:sma_200:-:*:*:*:*:*:*:*

Configuration 2 (hide)

AND
OR cpe:2.3:o:sonicwall:sma_210_firmware:10.2.0.8-37sv:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:sma_210_firmware:10.2.1.1-19sv:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:sma_210_firmware:10.2.1.2-24sv:*:*:*:*:*:*:*
cpe:2.3:h:sonicwall:sma_210:-:*:*:*:*:*:*:*

Configuration 3 (hide)

AND
OR cpe:2.3:o:sonicwall:sma_410_firmware:10.2.0.8-37sv:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:sma_410_firmware:10.2.1.1-19sv:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:sma_410_firmware:10.2.1.2-24sv:*:*:*:*:*:*:*
cpe:2.3:h:sonicwall:sma_410:-:*:*:*:*:*:*:*

Configuration 4 (hide)

AND
OR cpe:2.3:o:sonicwall:sma_400_firmware:10.2.0.8-37sv:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:sma_400_firmware:10.2.1.1-19sv:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:sma_400_firmware:10.2.1.2-24sv:*:*:*:*:*:*:*
cpe:2.3:h:sonicwall:sma_400:-:*:*:*:*:*:*:*

Configuration 5 (hide)

AND
OR cpe:2.3:o:sonicwall:sma_500v_firmware:10.2.0.8-37sv:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:sma_500v_firmware:10.2.1.1-19sv:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:sma_500v_firmware:10.2.1.2-24sv:*:*:*:*:*:*:*
cpe:2.3:h:sonicwall:sma_500v:-:*:*:*:*:*:*:*
History

31 Oct 2025, 17:13

Type Values Removed Values Added
References () https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-20038 - () https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-20038 - US Government Resource

22 Oct 2025, 00:17

Type Values Removed Values Added
References
  • () https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-20038 -

21 Oct 2025, 20:18

Type Values Removed Values Added
References
  • {'url': 'https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-20038', 'source': '134c704f-9b21-4f2e-91b3-4a467353bcc0'}

21 Oct 2025, 19:18

Type Values Removed Values Added
References
  • () https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-20038 -

21 Nov 2024, 05:45

Type Values Removed Values Added
References () https://github.com/jbaines-r7/badblood - Exploit, Third Party Advisory () https://github.com/jbaines-r7/badblood - Exploit, Third Party Advisory
References () https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0026 - Vendor Advisory () https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0026 - Vendor Advisory
References () https://www.rapid7.com/blog/post/2022/01/11/cve-2021-20038-42-sonicwall-sma-100-multiple-vulnerabilities-fixed-2/ - Exploit, Third Party Advisory () https://www.rapid7.com/blog/post/2022/01/11/cve-2021-20038-42-sonicwall-sma-100-multiple-vulnerabilities-fixed-2/ - Exploit, Third Party Advisory

13 May 2022, 14:54

Type Values Removed Values Added
References (MISC) https://github.com/jbaines-r7/badblood - (MISC) https://github.com/jbaines-r7/badblood - Exploit, Third Party Advisory
References (MISC) https://www.rapid7.com/blog/post/2022/01/11/cve-2021-20038-42-sonicwall-sma-100-multiple-vulnerabilities-fixed-2/ - (MISC) https://www.rapid7.com/blog/post/2022/01/11/cve-2021-20038-42-sonicwall-sma-100-multiple-vulnerabilities-fixed-2/ - Exploit, Third Party Advisory

29 Apr 2022, 12:15

Type Values Removed Values Added
References
  • (MISC) https://github.com/jbaines-r7/badblood -
  • (MISC) https://www.rapid7.com/blog/post/2022/01/11/cve-2021-20038-42-sonicwall-sma-100-multiple-vulnerabilities-fixed-2/ -

10 Dec 2021, 13:20

Type Values Removed Values Added
CVSS v2 : unknown
v3 : unknown 		v2 : 7.5
v3 : 9.8
References (CONFIRM) https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0026 - (CONFIRM) https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0026 - Vendor Advisory
CWE CWE-787
CPE cpe:2.3:o:sonicwall:sma_210_firmware:10.2.1.1-19sv:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:sma_410_firmware:10.2.1.2-24sv:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:sma_400_firmware:10.2.1.2-24sv:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:sma_500v_firmware:10.2.0.8-37sv:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:sma_210_firmware:10.2.0.8-37sv:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:sma_500v_firmware:10.2.1.1-19sv:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:sma_210_firmware:10.2.1.2-24sv:*:*:*:*:*:*:*
cpe:2.3:h:sonicwall:sma_200:-:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:sma_410_firmware:10.2.0.8-37sv:*:*:*:*:*:*:*
cpe:2.3:h:sonicwall:sma_210:-:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:sma_200_firmware:10.2.1.1-19sv:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:sma_200_firmware:10.2.1.2-24sv:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:sma_400_firmware:10.2.0.8-37sv:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:sma_410_firmware:10.2.1.1-19sv:*:*:*:*:*:*:*
cpe:2.3:h:sonicwall:sma_410:-:*:*:*:*:*:*:*
cpe:2.3:h:sonicwall:sma_500v:-:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:sma_400_firmware:10.2.1.1-19sv:*:*:*:*:*:*:*
cpe:2.3:h:sonicwall:sma_400:-:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:sma_500v_firmware:10.2.1.2-24sv:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:sma_200_firmware:10.2.0.8-37sv:*:*:*:*:*:*:*

08 Dec 2021, 10:15

Type Values Removed Values Added
New CVE
Information

Published : 2021-12-08 10:15

Updated : 2025-10-31 17:13

NVD link : CVE-2021-20038

Mitre link : CVE-2021-20038

CVE.ORG link : CVE-2021-20038

JSON object : View

Products Affected

sonicwall

  • sma_210_firmware
  • sma_200
  • sma_500v_firmware
  • sma_200_firmware
  • sma_400
  • sma_410_firmware
  • sma_410
  • sma_400_firmware
  • sma_500v
  • sma_210
CWE
CWE-121

Stack-based Buffer Overflow

CWE-787

Out-of-bounds Write