CVE-2021-20045Sma 200 Firmware Buffer Overflow
A buffer overflow vulnerability in SMA100 sonicfiles RAC_COPY_TO (RacNumber 36) method allows a remote unauthenticated attacker to potentially execute code as the 'nobody' user in the appliance.
Published Jan 4, 2022 · Updated Aug 3, 2024
Key Facts
Patch in the next maintenance window- CVE-2021-20045 is a critical-severity vulnerability (CVSS 9.8 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
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
25%
Higher than 97.9% of all scored CVEs
Exploit maturity
None known
ATLAS score
41/100
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 buffer overflow vulnerability in SMA100 sonicfiles RAC_COPY_TO (RacNumber 36) method allows a remote unauthenticated attacker to potentially execute code as the 'nobody' user in the appliance. 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-120 Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
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 buffer overflow vulnerability in SMA100 sonicfiles RAC_COPY_TO (RacNumber 36) method allows a remote unauthenticated attacker to potentially execute code as the 'nobody' user in the appliance.
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-2021-20045 On Your Attack Surface?
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