CVE-2021-42342
An issue was discovered in GoAhead 4.x and 5.x before 5.1.5. In the file upload filter, user form...
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
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.
- Record
CVE-2021-42342- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - CVSS 2.0
- 7.5 High
AV:N/AC:L/Au:N/C:P/I:P/A:P - Weakness
- CWE-434
- Updated
- 2026-11-02
CVE List No score
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.
- Record
CVE-2021-42342- Updated
- 2026-11-02
EUVDEUVD-2021-29315 No score
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.
- Record
EUVD-2021-29315- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-xrrx-hrm6-mxr7 No score
An issue was discovered in GoAhead 4.x and 5.x before 5.1.5. In the file upload filter, user form...
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.
- Record
GHSA-xrrx-hrm6-mxr7- Weakness
- CWE-434
- Updated
- 2026-11-02
Affected products
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| PoC in GitHub | Mr-xn/CVE-2021-42342 | 2022-01-04 |
| PoC in GitHub | kimusan/goahead-webserver-pre-5.1.5-RCE-PoC-CVE-2021-42342- | 2021-10-12 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, PoC in GitHub |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-42342 is a critical vulnerability (CVSS 9.8) in Embedthis Goahead, published October 14, 2021. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 59.5%, the 99th percentile. No source names a fixed version.