CVE-2021-21433Public exploitNetwork attack vector

Authenticated command execution via shell metacharacter injection

Published Apr 9, 2021 · Updated Aug 3, 2024

OS command injection in DEMON1A Discord-Recon 0.0.1 allows remote authenticated users to execute commands through Discord messages. The .dirsearch and .arjun handlers append unvalidated arguments to shell commands, so separators such as && introduce an additional command. Access to the bot's Discord server is required, and injected commands run with the bot process's permissions on its Linux host.

CVSS severity9.9
Critical
EPSS probability2.96%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in DEMON1A Discord-Recon 0.0.1 allows remote authenticated users to execute commands through Discord messages. The .dirsearch and .arjun handlers append unvalidated arguments to shell commands, so separators such as && introduce an additional command. Access to the bot's Discord server is required, and injected commands run with the bot process's permissions on its Linux host.

The record

CVE
CVE-2021-21433
Published
Apr 9, 2021
Updated
Aug 3, 2024
Vendor
DEMON1A
Product
Discord-Recon
Classifications
CWE-94, CWE-78, T1059.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 9, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=<= 0.0.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

DEMON1A · Discord-Reconversion=<= 0.0.1

Published CVSS scores

6.5NVDAV:N/AC:L/Au:S/C:P/I:P/A:P
8.8NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
9.9GitHub Security AdvisoriesCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1059.004Command and Scripting Interpreter: Unix Shell

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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