High severity · published Dec 8, 2021
CVE-2021-20041
An unauthenticated and remote adversary can consume all of the device's CPU due to crafted HTTP requests sent to SMA100 /fileshare/sonicfiles/sonicfiles resulting in a loop with…
7.5
CVSS
21.2%
EPSS
No
On KEV
Description
An unauthenticated and remote adversary can consume all of the device's CPU due to crafted HTTP requests sent to SMA100 /fileshare/sonicfiles/sonicfiles resulting in a loop with unreachable exit condition. This vulnerability affected SMA 200, 210, 400, 410 and 500v appliances.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)21.2% · higher than 98% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
S2
Sma 200 Firmware · Sonicwall
9.0.0.11-31sv; 10.2.0.8-37sv; 10.2.1.1-19sv · source: NVD
S2
Sma 210 Firmware · Sonicwall
9.0.0.11-31sv; 10.2.0.8-37sv; 10.2.1.1-19sv · source: NVD
S4
Sma 400 Firmware · Sonicwall
9.0.0.11-31sv; 10.2.0.8-37sv; 10.2.1.1-19sv · source: NVD
S4
Sma 410 Firmware · Sonicwall
9.0.0.11-31sv; 10.2.0.8-37sv; 10.2.1.1-19sv · source: NVD
S5
Sma 500v Firmware · Sonicwall
9.0.0.11-31sv; 10.2.0.8-37sv; 10.2.1.1-19sv · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-20041
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-20041
Vendor Advisory
https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0026
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