Critical severity · published Dec 8, 2021
CVE-2021-20038
SonicWall SMA 100 Appliances Stack-Based Buffer Overflow Vulnerability
RansomwareIn wildKEV
9.8
CVSS
99.9%
EPSS
Yes
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)99.9% · higher than 100% of CVEs
Exploited in the wildYes
CISA KEVListed Jan 28, 2022
Federal remediation dueFeb 11, 2022
Ransomware campaign useKnown
Affected products
Which versions
SS
SonicWall SMA100 · SonicWall
10.2.0.8-37sv and earlier; 10.2.1.1-19sv and earlier; 10.2.1.2-24sv and earlier · source: vendor
S2
Sma 200 Firmware · Sonicwall
10.2.0.8-37sv; 10.2.1.1-19sv; 10.2.1.2-24sv · source: NVD
S2
Sma 210 Firmware · Sonicwall
10.2.0.8-37sv; 10.2.1.1-19sv; 10.2.1.2-24sv · source: NVD
S4
Sma 400 Firmware · Sonicwall
10.2.0.8-37sv; 10.2.1.1-19sv; 10.2.1.2-24sv · source: NVD
S4
Sma 410 Firmware · Sonicwall
10.2.0.8-37sv; 10.2.1.1-19sv; 10.2.1.2-24sv · source: NVD
S5
Sma 500v Firmware · Sonicwall
10.2.0.8-37sv; 10.2.1.1-19sv; 10.2.1.2-24sv · source: NVD
S1
SMA 100 Appliances · SonicWall
All versions, or not specified · source: KEV
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-20038
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-20038
CISA KEV catalogue
https://www.cisa.gov/known-exploited-vulnerabilities-catalog
x_refsource_CONFIRM
https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0026
x_refsource_MISC
https://github.com/jbaines-r7/badblood
x_refsource_MISC
https://www.rapid7.com/blog/post/2022/01/11/cve-2021-20038-42-sonicwall-sma-100-multiple-vulnerabilities-fixed-2/
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