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CVE-2021-20038
CWE-121
Critical
103.8
RPSRPS range: 0–105; KEV-listed vulnerabilities can receive an exploitation amplifier.
Description
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.
Source: NVD
Signals
- CVSS
- 9.8
- Critical · v3.1
- EPSS
- 99.91%
- Probability of exploitation in the next 30 days (FIRST)
- CISA KEV
- In CISA KEV since Jan 2022
- Fix commit
- Fix commit known
- Sources: MoreFixes, FreshFixes
- Weakness
- CWE-121
- CWE-121, CWE-787
- Published
- 8 Dec 2021
- Last modified 31 Oct 2025
How to read these signals: RPS · EPSS · CISA KEV · Data sources
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Data as of 7 Oct 2026, 05:16 UK time