What is CVE-2021-21433?

CVE-2021-21433 is a critical-severity vulnerability in Demon1a Discord-Recon, classified under Code Injection. CVSS score: 9.9/10. Published 2021-04-09.

How severe is CVE-2021-21433?

Critical severity. CVSS v3 base score is 9.9 out of 10.

RCE in Demon1a Discord-Recon

CVE-2021-21433

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.

Vulnerability class: RCE (Remote Code Execution)

Published 2021-04-09 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:H.

EPSS exploit prediction

EPSS: 0.030 (86.7th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 87th percentile — 86.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.030 · newest: 0.030 · change: 0.000

Affected products

Demon1a Discord-Recon — versions <= 0.0.1

Weakness classification (CWE)

References

github.com/DEMON1A/Discord-Recon/security/advisories/GHSA-65fm-5x64-gv9x (Third Party Advisory)
github.com/DEMON1A/Discord-Recon/issues/6 (Exploit, Patch, Third Party Advisory, Issue Tracking)
github.com/DEMON1A/Discord-Recon/commit/26e2a084679679cccdeeabbb6889ce120eff7e50 (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2021-21433?: CVE-2021-21433 is a critical-severity vulnerability in Demon1a Discord-Recon, classified under Code Injection. CVSS score: 9.9/10. Published 2021-04-09.
How severe is CVE-2021-21433?: Critical severity. CVSS v3 base score is 9.9 out of 10.