Denial of service by the absence of restrictions on replies to posts in Discourse

published 2024-10-07 2 y ago modified 2026-09-10 59 d ago also BIT-discourse-2024-43789 , EUVD-2024-40449 , GHSA-62cq-cpmc-hvqq

cvss: 7.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.5%; EPSS 0.5% chance of exploitation in 30 days, percentile 40%
public exploits: 0; none known

Discourse is an open source platform for community discussion. A user can create a post with many replies, and then attempt to fetch them all at once. This can potentially reduce the availability of a Discourse instance. This problem has been patched in the latest version of Discourse. All users area are advised to upgrade. There are no known workarounds for this vulnerability.

Patch / fix

fixed in 2

bitnami discourse 3.3.1
discourse discourse 3.3.1, 3.4.0.beta1

CISA SSVC

Exploitation: none
Automatable: yes
Technical impact: partial
Assessed: 2 y ago (2024-10-08)

Exploit prediction

0.46% chance of exploitation in the next 30 days, higher than 40% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD	3.1	4.3	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
OSV	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem	package	affected	fixed in
bitnami	discourse	<3.3.1	3.3.1

Affected products

discourse discourse

Classification

Weakness

CWE-400 Uncontrolled Resource Consumption

References

github.com /discourse/discourse/security/advisories/GHSA-62cq-cpmc-hvqq
third-party-advisory, advisory
nvd.nist.gov /vuln/detail/CVE-2024-43789
web

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.

Summary