What’s Vulnerable › Vulnerabilities
CVE-2021-42342
- Severity: critical (CVSS 9.8 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 59.5% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2021-10-14 · updated 2026-06-17
- Weakness: CWE-434
Description
An issue was discovered in GoAhead 4.x and 5.x before 5.1.5. In the file upload filter, user form variables can be passed to CGI scripts without being prefixed with the CGI prefix. This permits tunneling untrusted environment variables into vulnerable CGI scripts.
Affected products
- EmbedThis GoAhead: from 4.0.0 through 4.1.3; from 5.0.0 before 5.1.5 — fixed in 5.1.5
How to fix
Upgrade to a fixed version: EmbedThis GoAhead 5.1.5. Check the vendor advisory for mitigations.
References
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