CVE-2021-4040A flaw was found in AMQ Broker. This issue can cause a partial interruption to the availability of AMQ Broker via an Out of memory (OOM)…
- 5.3MediumCVSS base score
- 3.4%Exploitation in 30 daysEPSS · top 11% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
A flaw was found in AMQ Broker. This issue can cause a partial interruption to the availability of AMQ Broker via an Out of memory (OOM) condition. This flaw allows an attacker to partially disrupt availability to the broker through a sustained attack of maliciously crafted messages. The highest threat from this vulnerability is system availability.
Timeline
ID reserved
By redhat
- 9 months later
· 9 months later
Published
- 24 months later
· 24 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | Medium5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |
- EPSS (exploitation in 30 days)
- 3.4% · top 11% of all CVEs (12 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.3.
Affected products
AMQ Broker
- affected Fixed in v2.19.1, v2.20.0
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- Mavenorg.apache.activemq:artemis-core-clientGHSA-gf8c-j759-86mg (opens in a new tab)
References
References4
- https://bugzilla.redhat.com/show_bug.cgi?id=2028254 (opens in a new tab)x_refsource_MISCx_transferred
- https://access.redhat.com/security/cve/CVE-2021-4040 (opens in a new tab)x_refsource_MISCx_transferred
- https://issues.apache.org/jira/browse/ARTEMIS-3593 (opens in a new tab)x_refsource_MISCx_transferred
- https://github.com/apache/activemq-artemis/pull/3871/commits (opens in a new tab)x_refsource_MISCx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2022-6556 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-gf8c-j759-86mg (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2021-4040)Record last updated .