How severe is CVE-2024-21658?

CVE-2024-21658 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.

Is CVE-2024-21658 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2024-21658?

CVE-2024-21658 affects Discourse Discourse Calendar. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2024-21658?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2024-21658 have an EU (EUVD) identifier?

Yes. CVE-2024-21658 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-19284.

When was CVE-2024-21658 published?

CVE-2024-21658 was published on 2024-08-30 and last updated on 2026-06-17.

CVE-2024-21658

CVE-2024-21658 is a medium-severity vulnerability in Discourse Discourse Calendar with a CVSS 3.x base score of 4.3. 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-770.

Key facts

Severity: Medium (CVSS 3.x base score 4.3)
EPSS exploit prediction: 0% (28th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2024-19284
Weakness: CWE-770
Affected product: Discourse Discourse Calendar
Published: 2024-08-30
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2024-21658?: 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.
How severe is CVE-2024-21658?: CVE-2024-21658 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.
Is CVE-2024-21658 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2024-21658?: CVE-2024-21658 affects Discourse Discourse Calendar. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2024-21658?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2024-21658 have an EU (EUVD) identifier?: Yes. CVE-2024-21658 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-19284.
When was CVE-2024-21658 published?: CVE-2024-21658 was published on 2024-08-30 and last updated on 2026-06-17.

References

https://github.com/discourse/discourse-calendar/security/advisories/GHSA-65f2-9ghp-x8h8

Affected products (1)

cpe:2.3:a:discourse:discourse_calendar:*:*:*:*:*:discourse:*:*

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