CVE-2021-20040

—

CVSS 3.1

7.5 high

EPSS

25%p98

Published

Dec 8, 2021 (Dec 8, 2021)

Modified

Jun 17, 2026

Description

A relative path traversal vulnerability in the SMA100 upload funtion allows a remote unauthenticated attacker to upload crafted web pages or files as a 'nobody' user. This vulnerability affected SMA 200, 210, 400, 410 and 500v appliances.

Vendors: sonicwall
Products: sma 200 firmware, sma 210 firmware, sma 410 firmware, sma 400 firmware, sma 500v firmware
Weakness: CWE-23, CWE-22
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

NVD CVE.org GitHub PoCs EPSS (25.1%)

In the news2 stories

SonicWall Urges Customers to Immediately Patch Critical SMA 100 Flaws

The Hacker NewsDec 9, 05:18 UTC · Dec 9, 2021Vulnerability in the wildCVE-2021-20038 CVE-2021-20039 CVE-2021-20040+5 CVEs

SonicWall strongly urges customers to apply patches to SMA 100 devices

Security AffairsDec 8, 20:08 UTC · Dec 8, 2021Vulnerability CVE-2021-20038 CVE-2021-20045 CVE-2021-20039+5 CVEs