Home/CVE/An improper access control vulnerability in SMA100 allows a remote unauthenticated attacker to bypass the path traversal
CVE

CVE-2021-20034

An improper access control vulnerability in SMA100 allows a remote unauthenticated attacker to bypass the path traversal

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.

CRITICAL · CVSS 9.1 EPSS 0.05436
Act now
  • EPSS percentile: top 10% of all CVEs by exploitation likelihood
  • Public exploit or PoC is available
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-284Improper Access Control
▤

Affected Products & Versions

15
sonicwall sma 200 firmware<= 9.0.0.10-28sv
sonicwall sma 200 firmware>= 10.2.0.0 and <= 10.2.0.7-34sv
sonicwall sma 200 firmware>= 10.2.1.0 and <= 10.2.1.0-17sv
sonicwall sma 210 firmware<= 9.0.0.10-28sv
sonicwall sma 210 firmware>= 10.2.0.0 and <= 10.2.0.7-34sv
sonicwall sma 210 firmware>= 10.2.1.0 and <= 10.2.1.0-17sv
sonicwall sma 400 firmware<= 9.0.0.10-28sv
sonicwall sma 400 firmware>= 10.2.0.0 and <= 10.2.0.7-34sv
⚠

Public Exploits & PoCs

2
webappsSonicWall SMA 10.2.1.0-17sv - Password Reset2021-10-20
pocpacketstormsecurity.com · SonicWall-SMA-10.2.1.0-17sv-Password-Reset.htmlpacketstormsecurity.com
◈

Detection Rules (IDS/IPS)

1
et-openET WEB_SERVER SonicWall SMA Unauthenticated handleWAFRedirect CGI Arbitrary File Deletion (CVE-2021-20034)web-application-attack
Open rulesets (ET Open, Snort Community, abuse.ch) link to source. Commercial rulesets are reference-only.
▣

Scoring & Timeline

9.1
CRITICAL · CVSS v3.1 · PSIRT@sonicwall.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD27 Sep 2021 · 06:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
🔗

References & Sources

1
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0021Vendor Advisory
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