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CVE-2021-4040

21
FAUCET Score

CVE-2021-4040 describes a denial-of-service vulnerability in AMQ Broker and Apache ActiveMQ Artemis, where a sustained attack of maliciously crafted messages can lead to an Out of Memory (OOM) condition. This flaw has a CVSS score of 5.3 (Medium), indicating it can be exploited remotely with low complexity and no privileges, primarily impacting system availability. There is no evidence of active exploitation, publicly available exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
< 7.10.0CPE matchmatch criteria
cpe:2.3:a:redhat:amq_broker:*:*:*:*:*:*:*:*
< 2.19.1CPE matchmatch criteria
cpe:2.3:a:apache:artemis:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.3MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
LOW
Exploitability Score
3.9
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.50%
Probability of exploitation in next 30 days
EPSS Percentile
83.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0250 is in the 75th percentile among its peer group of 23,701 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (4)

github_advisorypatch availablevia nvd_reference
View patch
mavenpatch availablevia ghsa
Product: org.apache.activemq:artemis-core-clientFixed in: 2.19.1
redhatpatch availablevia redhat_api
Product: Red Hat AMQ 7.10.0Fixed in: broker
View patch
redhatvendor investigatingvia nvd_reference
View patch

Vendor Advisories (2)

mavenGHSA-gf8c-j759-86mgmedium

org.apache.activemq:artemis-core-client Vulnerable to Out-of-Bounds Write

Aug 25, 2022
redhatCVE-2021-4040Moderate

Broker: Malformed message can result in partial DoS (OOM)

Nov 19, 2021

References

access.redhat.com / security/cve/CVE-2021-4040
Vendor Advisory
bugzilla.redhat.com / show_bug.cgi
Issue TrackingVendor Advisory
github.com / apache/activemq-artemis/pull/3871/commits
PatchThird Party Advisory
issues.apache.org / jira/browse/ARTEMIS-3593
PatchThird Party Advisory