How severe is CVE-2021-21433?

CVE-2021-21433 has a CVSS 3.x base score of 9.9, rated critical severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity high, and availability high.

Is CVE-2021-21433 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-21433?

CVE-2021-21433 affects Demon1a Discord-recon. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-21433?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2021-21433 published?

CVE-2021-21433 was published on 2021-04-09 and last updated on 2026-06-17.

CVE-2021-21433

CVE-2021-21433 is a critical-severity vulnerability in Demon1a Discord-recon with a CVSS 3.x base score of 9.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-78.

Key facts

Severity: Critical (CVSS 3.x base score 9.9)
CVSS v2: 6.5
EPSS exploit prediction: 3% (86th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-78
Affected product: Demon1a Discord-recon
Published: 2021-04-09
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2021-21433?: CVE-2021-21433 has a CVSS 3.x base score of 9.9, rated critical severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity high, and availability high.
Is CVE-2021-21433 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-21433?: CVE-2021-21433 affects Demon1a Discord-recon. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-21433?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-21433 published?: CVE-2021-21433 was published on 2021-04-09 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:demon1a:discord-recon:*:*:*:*:*:*:*:*

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