Buffer overflow in Sonicwall Sma100
CVE-2021-20038
A Stack-based buffer overflow vulnerability in SMA100 Apache httpd server's mod_cgi module environment variables allows a remote unauthenticated attacker to potentially execute code as a 'nobody' user in the appliance. This vulnerability a…
Vulnerability class: Buffer Overflow
EPSS: 0.943 (99.9th percentile) — read the EPSS interpretation.
Affected products
- Sonicwall Sma100 — versions 10.2.0.8-37sv and earlier, 10.2.1.1-19sv and earlier, 10.2.1.2-24sv and earlier
Weakness classification (CWE)
CISA KEV (Known Exploited Vulnerabilities)
This CVE is on the CISA KEV catalog, added on . CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.
BOD 22-01 due date: .
Required action: Apply updates per vendor instructions.
Known ransomware campaign use: yes.
Public proof-of-concept exploits
References
- psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0026 (x_refsource_CONFIRM)
- github.com/jbaines-r7/badblood (x_refsource_MISC)
- www.rapid7.com/blog/post/2022/01/11/cve-2021-20038-42-sonicwall-sma-100-multipl… (x_refsource_MISC)
Frequently asked questions
- What is CVE-2021-20038?
- CVE-2021-20038 is a vulnerability in Sonicwall Sma100, classified under Stack-based Buffer Overflow. Published 2021-12-08.
- Is CVE-2021-20038 known to be exploited?
- Yes. CVE-2021-20038 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-01-28), indicating it is being actively exploited. 29 public proof-of-concept repositories are indexed.