CVE-2021-20040Sma 200 Firmware Path Traversal
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.
Published Jan 4, 2022 · Updated Aug 3, 2024
Key Facts
Patch in the next maintenance window- CVE-2021-20040 is a high-severity vulnerability (CVSS 7.5 v3.1) affecting Sma 200 Firmware (Sonicwall), Sma 210 Firmware (Sonicwall), Sma 400 Firmware (Sonicwall) and 3 more products.
- It is not listed in any known-exploited vulnerabilities catalog. No public exploit code is known.
- EPSS estimates a 25% probability of exploitation in the next 30 days.
- No fixed version is listed yet; check the vendor advisory for mitigations.
- Brandefense priority: patch in the next maintenance window, because of its high severity, although no exploitation is known.
Scores
CVSS v3.1
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
EPSS (30-day exploit likelihood)
25%
Higher than 97.9% of all scored CVEs
Exploit maturity
None known
ATLAS score
38/100
Publication score, see How it works
Exploitation Verdict
KEV listed
Not listed
Federal due date
None
No federal due date
Ransomware use
Not reported
Attributed actors
None named
Exploit & Defence Guidance
Exploit maturity
None known
Public exploit code
0
Proof-of-concept links
In-the-wild evidence
0
Reports of active use
Advisories And Exploit References
- advisoryhttps://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0026
- advisoryhttps://securityaffairs.co/
- advisoryhttps://securityaffairs.co/wordpress/125400/security/sonicwall-sma-100-devices-flaws.html
- advisoryhttps://threatpost.com/critical-sonicwall-vpn-bugs-appliance-takeover/176869/
- advisoryhttps://us-cert.cisa.gov/ncas/current-activity/2021/12/08/sonicwall-releases-security-advisory-sma-100-series-appliances
- advisoryhttps://www.cisecurity.org/advisory/multiple-vulnerabilities-in-sonicwall-sma-100-series-could-allow-for-arbitrary-code-execution_2021-157/
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.
Affected Products
11 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Sma 200 FirmwareSonicwall | 10.2.0.8-37sv, 10.2.1.1-19sv | n/a |
| Sma 210 FirmwareSonicwall | 10.2.0.8-37sv, 10.2.1.1-19sv | n/a |
| Sma 400 FirmwareSonicwall | 10.2.0.8-37sv, 10.2.1.1-19sv | n/a |
| Sma 410 FirmwareSonicwall | 10.2.0.8-37sv, 10.2.1.1-19sv | n/a |
| Sma 500v FirmwareSonicwall | 10.2.0.8-37sv, 10.2.1.1-19sv | n/a |
Timeline
Publicly disclosed
Jan 4, 2022
Last updated
Aug 3, 2024
Weakness Type
- CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
- CWE-23 Relative Path Traversal
References
- advisorypsirt.global.sonicwall.com · SNWLID-2021-0026
- advisorysecurityaffairs.co
- advisorysecurityaffairs.co · sonicwall-sma-100-devices-flaws.html
- advisorythreatpost.com · 176869
- advisoryus-cert.cisa.gov · sonicwall-releases-security-advisory-sma-100-se…
FAQ
Common Questions.
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.
Affected: Sma 200 Firmware (Sonicwall) versions 10.2.0.8-37sv, 10.2.1.1-19sv; Sma 210 Firmware (Sonicwall) versions 10.2.0.8-37sv, 10.2.1.1-19sv; Sma 400 Firmware (Sonicwall) versions 10.2.0.8-37sv, 10.2.1.1-19sv, 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.
No public exploit code is known.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch in the next maintenance window, because of its high severity, although no exploitation is known.
Is CVE-2021-20040 On Your Attack Surface?
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