CVE-2021-20034
CriticalPublic exploitAn 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.
Published Sep 27, 2021 · Updated Nov 21, 2024
Key Facts
Patch immediately- CVE-2021-20034 is a critical-severity vulnerability (CVSS 9.1 v3.1) affecting Sma 500v (Sonicwall), Sma 200 Firmware (Sonicwall), Sma 210 Firmware (Sonicwall) and 3 more products.
- It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
- EPSS estimates a 81% probability of exploitation in the next 30 days.
- Fixed versions are available, including Sma 200 Firmware <=9.0.0.10-28sv, Sma 210 Firmware <=9.0.0.10-28sv, Sma 400 Firmware <=9.0.0.10-28sv.
- Brandefense priority: patch immediately, because it is very likely to be exploited soon.
CVSS v3.1
9.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
EPSS (30-day exploit likelihood)
81%
Higher than 99.6% of all scored CVEs
Exploited in the wild
No known
Not in a known-exploited catalog
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2021-20034 brief as a PDF
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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.
Affected Products
6 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Sma 500vSonicwall | See advisory | 9.0.0.10-28sv |
| Sma 200 FirmwareSonicwall | See advisory | 9.0.0.10-28sv |
| Sma 210 FirmwareSonicwall | See advisory | 9.0.0.10-28sv |
| Sma 400 FirmwareSonicwall | See advisory | 9.0.0.10-28sv |
| Sma 410 FirmwareSonicwall | See advisory | 9.0.0.10-28sv |
Patched Releases
Sma 200 Firmware
<=9.0.0.10-28sv
Sma 210 Firmware
<=9.0.0.10-28sv
Sma 400 Firmware
<=9.0.0.10-28sv
Sma 410 Firmware
<=9.0.0.10-28sv
Sma 500v
<=9.0.0.10-28sv
Timeline
Publicly disclosed
Sep 27, 2021
Last updated
Nov 21, 2024
Weakness Type
- CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
- CWE-284 Improper Access Control
References
FAQ
Common Questions.
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.
Affected: Sma 500v (Sonicwall); Sma 200 Firmware (Sonicwall); Sma 210 Firmware (Sonicwall), among others. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
Fixed versions are available, including Sma 200 Firmware <=9.0.0.10-28sv, Sma 210 Firmware <=9.0.0.10-28sv, Sma 400 Firmware <=9.0.0.10-28sv.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.
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