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Fencer Intel
critical 9.9

CVE-2021-21433 json

Remote code execution on discord-recon .dirsearch and .arjun commands due to improper input validation

published 5y ago modified 4mo ago also EUVD-2021-8707

cvss
9.9
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
3.3%
EPSS 3.3% chance of exploitation in 30 days, percentile 88%
public exploits
0
none known

Summary

Discord Recon Server is a bot that allows you to do your reconnaissance process from your Discord. Remote code execution in version 0.0.1 would allow remote users to execute commands on the server resulting in serious issues. This flaw is patched in 0.0.2.

Patch / fix

  • demon1a discord-recon 0.0.2

Is CVE-2021-21433 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

3.28% chance of exploitation in the next 30 days, higher than 88% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • github.com https://github.com/DEMON1A/Discord-Recon/issues/6 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 9.9 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:H
NVD 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 6.5 AV:N/AC:L/Au:S/C:P/I:P/A:P

Affected products

  • DEMON1A Discord-Recon

Classification

Weakness
  • CWE-94 Improper Control of Generation of Code
  • CWE-78 Improper Neutralization of Special Elements used in an OS Command

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.