Critical severity · published Sep 27, 2021
CVE-2021-20034
An improper access control vulnerability in SMA100 allows a remote unauthenticated attacker to bypass the path traversal checks and delete an arbitrary file potentially resulting…
9.1
CVSS
81.8%
EPSS
No
On KEV
Description
An improper access control vulnerability in SMA100 allows a remote unauthenticated attacker to bypass the path traversal checks and delete an arbitrary file potentially resulting in a reboot to factory default settings.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)81.8% · higher than 100% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
S2
Sma 200 Firmware · Sonicwall
through 9.0.0.10-28sv; 10.2.0.0 through 10.2.0.7-34sv; 10.2.1.0 through 10.2.1.0-17sv · source: NVD
S2
Sma 210 Firmware · Sonicwall
through 9.0.0.10-28sv; 10.2.0.0 through 10.2.0.7-34sv; 10.2.1.0 through 10.2.1.0-17sv · source: NVD
S4
Sma 400 Firmware · Sonicwall
through 9.0.0.10-28sv; 10.2.0.0 through 10.2.0.7-34sv; 10.2.1.0 through 10.2.1.0-17sv · source: NVD
S4
Sma 410 Firmware · Sonicwall
through 9.0.0.10-28sv; 10.2.0.0 through 10.2.0.7-34sv; 10.2.1.0 through 10.2.1.0-17sv · source: NVD
S5
Sma 500v · Sonicwall
through 9.0.0.10-28sv; 10.2.0.0 through 10.2.0.7-34sv; 10.2.1.0 through 10.2.1.0-17sv · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-20034
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-20034
Exploit
http://packetstormsecurity.com/files/164564/SonicWall-SMA-10.2.1.0-17sv-Password-Reset.html
Vendor Advisory
https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0021
More from Sma 200 Firmware
9.8
CVE-2021-20038
SonicWall SMA 100 Appliances Stack-Based Buffer Overflow Vulnerability
9.8
CVE-2021-20016
SonicWall SSLVPN SMA100 SQL Injection Vulnerability
9.1
CVE-2024-38475
Apache HTTP Server weakness in mod_rewrite when first segment of substitution matches filesystem path.
7.2
CVE-2023-44221
SonicWall SMA100 Appliances OS Command Injection Vulnerability
6.5
CVE-2021-20035
SonicWall SMA100 Appliances OS Command Injection Vulnerability