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Fencer Intel
critical 9.8

CVE-2021-42342 in the critical feed json

An issue was discovered in GoAhead 4.x and 5.x before 5.1.5.

published 5y ago modified 4mo ago also EUVD-2021-29315

cvss
9.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
59.5%
EPSS 59.5% chance of exploitation in 30 days, percentile 99.1%
public exploits
0
none known

Summary

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.

Patch / fix

  • embedthis goahead 5.1.5

Is CVE-2021-42342 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Exploit prediction

59.46% chance of exploitation in the next 30 days, higher than 99.1% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Classification

Weakness
  • CWE-434 Unrestricted Upload of File with Dangerous Type

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.