SARA / Free Tools / CVE / CVE-2021-20038

CVE-2021-20038 — SonicWall SMA 100 Appliances Stack-Based Buffer Overflow Vulnerability

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 affected SMA 200, 210, 400,

CVSS
EPSS
94.29% (top 0.10%)
CWE
CWE-121
Published
2021-12-08T09:55:20.000Z
Last modified
2025-10-21T23:25:23.415Z
CVSS vector
CISA KEV — Actively Exploited
Added to KEV
2022-01-28
BOD 22-01 due
2022-02-11
Ransomware use
Known

01What is this vulnerability?

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 affected SMA 200, 210, 400, 410 and 500v appliances firmware 10.2.0.8-37sv, 10.2.1.1-19sv, 10.2.1.2-24sv and earlier versions.

02Affected products

VendorProductVersions
SonicWallSonicWall SMA10010.2.0.8-37sv and earlier, 10.2.1.1-19sv and earlier, 10.2.1.2-24sv and earlier

03Active exploitation status

Yes — actively exploited. Added to the CISA KEV catalog on 2022-01-28. Ransomware use: Known.

04Recommended remediation

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

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07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

09References

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