CVE-2024-21658

Name: CVE-2024-21658
Creator: NVD / NIST
Published: 2024-08-30T18:15:06.717+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.3/10EPSS 0.36%

Last modified Jun 17, 2026

CVE-2024-21658 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. discourse-calendar is a discourse plugin which adds the ability to create a dynamic calendar in the first post of a topic. The limit on region value length is too generous. EPSS estimates a 0.36% chance of exploitation in the next 30 days.

Description

discourse-calendar is a discourse plugin which adds the ability to create a dynamic calendar in the first post of a topic. The limit on region value length is too generous. This allows a malicious actor to cause a Discourse instance to use excessive bandwidth and disk space. This issue has been patched in main the main branch. There are no workarounds for this vulnerability. Please upgrade as soon as possible.

Metrics

CVSS 3.1

4.3/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

EPSS Probability

0.36%

28.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Discourse	Discourse Calendar	< 2024-08-28

References

https://github.com/discourse/discourse-calendar/security/advisories/GHSA-65f2-9ghp-x8h8Vendor Advisory

Timeline

Published: Aug 30, 2024
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2024-21658?

How severe is CVE-2024-21658?

CVE-2024-21658 has a CVSS score of 4.3/10 (MEDIUM severity). The EPSS model estimates a 0.36% probability of exploitation in the next 30 days.

How do I fix CVE-2024-21658?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2024-21658?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST